will300

Update 05/05/19 - Japfest 2019
Today I attended Japfest 2019 at Silverstone, with 59 other members of the drivers/owners club. This was a great turn out for the club and nice to see so many faces new and old. 
Here's a couple of photo's of my car from the day. There are a couple of close up of the Verus Engineering splitter with race upgrade kit and dry carbon end plates, as I've just noticed I haven't posted any close up's before. 

Update 05/05/19 - Japfest 2019
Today I attended Japfest 2019 at Silverstone, with 59 other members of the drivers/owners club. This was a great turn out for the club and nice to see so many faces new and old. 
Here's a couple of photo's of my car from the day. There are a couple of close up of the Verus Engineering splitter with race upgrade kit and dry carbon end plates, as I've just noticed I haven't posted any close up's before. 

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

Here's the weight of the Reyland setup - taken from the AP Racing website
CP9200 Calipers without pads & brackets: 2.43kg
330mm x 28mm AP Racing brake rotor (Not including the hat/bell): 5.94kg

Here's the weight of the Reyland setup - taken from the AP Racing website
CP9200 Calipers without pads & brackets: 2.43kg
330mm x 28mm AP Racing brake rotor (Not including the hat/bell): 5.94kg

Peter Collen (of AP racing) is a fountain of knowledge when it comes to picking AP racing parts. 
 
Thanks for acknowledging me @will300 
 
I spoke to Martin Hadland about the CP9200 kit about 4 years ago before the CP9200 was out but I knew it was in development and a replacement to the CP5200.
Ultimately I decided I wanted a bigger 355mm disc because I am supercharged and wanted to run soft street friendly pads. Otherwise the Reyland kit with the CP9200 is the best 330mm kit for the 86 if you want road and track use. The Essex parts kits are excellent competition kits but the calipers wont last very well in your winter road conditions. 
 
So if you want a 330mm disc for road and track: Reyland 330mm CP9200
If you want a racing brake setup that can handle race pads without killing the caliper, but not a good idea for the road; Essex Endurance kit. 

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

Yes plenty of clearance with the 949Racing wheels, see:
 

@Mike 
Here some of my observations of the various kits - bare in mind I thought about this for 18 months before committing to the Reyland kit.
I actually ordered but then cancelled both the Essex AP Racing Sprint kit and the Godspeed AP kit, before settling on the Reyland kit, this was after speaking with @Ade and one of the technical team at AP Racing.
These are for the approx 330mm kits (355mm+ kits have different requirements) 
Reyland - AP Kit:
Pro's:
AP Caliper - CP9200 (2 piece aluminum body)  4 Pistons Dust Boots - Made by Brembo  Perfect for Street and track Common Pad Size 330mm x 28mm discs - 2 piece Good thermal capacity High quality caliper by premium brake manufacturer.  Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Various disc options - Either bolted or floating brake disc hat/bell. AP or Reyland disc's.  Clear's the majority of 17" wheels Latest design of caliper by AP Racing - including new paint finish Used by various members of the community - with extensive track use Con's:
Reasonably expensive Custom made brackets, which you need to shim to get perfect fitment Won't fit under stock wheels without spacer.  
Godspeed - Brembo's:
Pro's: 
Brembo caliper 4 piston Dust boots 330 x 28 discs 2 piece discs Cheap Con's: 
Unknown caliper model Unknown caliper material Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size No brake lines included  
Godspeed - AP Kit:
Pro's:
AP Caliper - CP9040 (2 piece aluminum body)  Dust Boots - Made by Brembo  Common Pad Size Good thermal capacity High quality caliper by premium brake manufacturer.  Latest design of caliper by AP Racing - including new paint finish Con's
Reasonably expensive Caliper designed for a 362mm disc - not 330mm as included Caliper designed for a 32mm thick disc - not 30mm as included Ø330mm disc in this caliper will leave a fairly large gap between the discs OD and the calipers disc pathway and this gap can be prone to collecting road debris. 6 pistons - overkill  No brake lines included  
K-Sport: 
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 330mm x 32mm? disc - 2 piece Dust boots Perfect for Street and track Con's
8 pistons Unknown piston sizes - not sure what effect this will have on brake bias Unknown pad size Unknown replacement disc price Won't fit under stock wheels without spacer.  
STi Brembo's - Used on Subaru Impreza WRX STi:
Pro's:
Cheap Used by various members of the community - with extensive track use Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc Various disc options Common pad size Dust boots 4 pistons Con's
Shifts brake bias forward massively Steel calipers - heavy Bleed nipples need swapping - i.e. caliper refurb before fitment Not a complete kit Won't fit under stock wheels without spacer. Only available second hand  
RR Racing (Wilwood😞
Pro's:
Cheap Wilwood caliper Complete kit - Calipers, Pads, Brake lines, brackets, discs 326mm x 30mm disc - STi disc's so cheap replacements Clear's the majority of 17" wheels Con's
6 pistons  no dust boots Won't fit under stock wheels without spacer. Limited pad selection Only available from the US Moves brake bias forward  
Essex Parts - AP Racing Sprint Kit:
Pro's:
AP Caliper - CP8350  4 Pistons Perfect for Track Use Common Pad Size 2 piece discs Extremely light High quality caliper by premium brake manufacturer.  Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels Keeps stock brake bias Used by various members of the community - with extensive track use Con's:
Expensive 299x32mm disc's - Can have some thermal issues Only available from the US Won't fit under stock wheels without spacer. No dust boots Not a daily driver friendly caliper  
AP Racing Genuine kit:
Pro's:
AP Caliper - CP6600 (2 piece aluminum body)  4 Pistons Dust Boots Perfect for Street and track Keeps stock brake bias Complete kit - Calipers, Pads, Brake lines, brackets, discs Clear's the majority of 17" wheels - including stock wheels Con's:
Very Expensive 26mm thick discs Limited pad options Limited disc options Uses older AP caliper  
Stoptech ST40:
Pro's:
Stoptech ST40 caliper 4 Pistons Clear's the majority of 17" wheels Complete kit - Calipers, Pads, Brake lines, brackets, discs 328mm x 28mm disc - 2 piece Dust boots Perfect for Street and track Con's
Expensive Can't 100% confirm piston sizes Limited pad replacement options Unknown replacement disc cost Won't fit under stock wheels without spacer.  

Rear pfc.08 pads arrived so just the discs to get now. Still got a little life left in my old ones so these will probably go on in the summer. 

You've never used a Subaru dealer then..... 😆

You've never used a Subaru dealer then..... 😆

Welcome Adam.
You've just reminded me I need to sort out another Midlands meet. 

Unfortunately @Badger there is no simple or easy way to fix this (on the BRZ atleast). I've looked into this abit and the options I came across were:
1. Smoothing the moustache, filling the holes and painting it. - The bodyshop I took it to said they could do it, but it'll look terrible and he'd rather not do it. 
2. Buy a US spec bumper / facelift bumper - Expensive
3. Wrapping the moustache - Cheap, but the holes would still be noticable
4. Cutting the moustache out. 
5. Getting a moustache cover (Kansai Service make one) - Best option I could fine.
6. Replacing the bumper with an aftermarket one.
There is a load of info here: https://www.ft86club.com/forums/showthread.php?t=4265
 

Update 19/03/2019 - Bedford Trackday
Another month, another trackday. This time at Bedford Autodrome, I've been to Bedford several times now and it's such a good circuit as it has quite a mixed track layout, long straights, tight corners, hairpins, chicanes, etc. It was a fantastic day, everyone was well behaved, there was lots of track time, only 1 red flag and little traffic. The weather was also good for March and dry for most of the day, other than 5 mins at lunch when there was a quick shower. 
Thank you @VAD17 for arranging. 
There is nothing new to report on the car, it performed relatively flawlessly as expected. A few things I've noticed, the car doesn't seem to roll as much at Bedford compared to Silverstone, so Anti Roll Bars have been removed from the shopping list for now. Suspension for both track day was set at the 1st click from full stiff. @willclarke said it's very flat round the corners which he didn't expect. Overall I'm happy with the balance of the car, its very neutral, precise and easy to rotate on throttle, making it excellent in the corners.  
My only complaint is with my brake fluid. I'm not happy with how my pedal feels and how soft it gets after a short period. I'm currently using ATE Type 200 which although is track focused, I think I'm going to get something with a higher boiling point.
Here are a couple of photo's from the day:
 

Update 19/03/2019 - Bedford Trackday
Another month, another trackday. This time at Bedford Autodrome, I've been to Bedford several times now and it's such a good circuit as it has quite a mixed track layout, long straights, tight corners, hairpins, chicanes, etc. It was a fantastic day, everyone was well behaved, there was lots of track time, only 1 red flag and little traffic. The weather was also good for March and dry for most of the day, other than 5 mins at lunch when there was a quick shower. 
Thank you @VAD17 for arranging. 
There is nothing new to report on the car, it performed relatively flawlessly as expected. A few things I've noticed, the car doesn't seem to roll as much at Bedford compared to Silverstone, so Anti Roll Bars have been removed from the shopping list for now. Suspension for both track day was set at the 1st click from full stiff. @willclarke said it's very flat round the corners which he didn't expect. Overall I'm happy with the balance of the car, its very neutral, precise and easy to rotate on throttle, making it excellent in the corners.  
My only complaint is with my brake fluid. I'm not happy with how my pedal feels and how soft it gets after a short period. I'm currently using ATE Type 200 which although is track focused, I think I'm going to get something with a higher boiling point.
Here are a couple of photo's from the day:
 

Update 19/03/2019 - Bedford Trackday
Another month, another trackday. This time at Bedford Autodrome, I've been to Bedford several times now and it's such a good circuit as it has quite a mixed track layout, long straights, tight corners, hairpins, chicanes, etc. It was a fantastic day, everyone was well behaved, there was lots of track time, only 1 red flag and little traffic. The weather was also good for March and dry for most of the day, other than 5 mins at lunch when there was a quick shower. 
Thank you @VAD17 for arranging. 
There is nothing new to report on the car, it performed relatively flawlessly as expected. A few things I've noticed, the car doesn't seem to roll as much at Bedford compared to Silverstone, so Anti Roll Bars have been removed from the shopping list for now. Suspension for both track day was set at the 1st click from full stiff. @willclarke said it's very flat round the corners which he didn't expect. Overall I'm happy with the balance of the car, its very neutral, precise and easy to rotate on throttle, making it excellent in the corners.  
My only complaint is with my brake fluid. I'm not happy with how my pedal feels and how soft it gets after a short period. I'm currently using ATE Type 200 which although is track focused, I think I'm going to get something with a higher boiling point.
Here are a couple of photo's from the day:
 

Update 19/03/2019 - Bedford Trackday
Another month, another trackday. This time at Bedford Autodrome, I've been to Bedford several times now and it's such a good circuit as it has quite a mixed track layout, long straights, tight corners, hairpins, chicanes, etc. It was a fantastic day, everyone was well behaved, there was lots of track time, only 1 red flag and little traffic. The weather was also good for March and dry for most of the day, other than 5 mins at lunch when there was a quick shower. 
Thank you @VAD17 for arranging. 
There is nothing new to report on the car, it performed relatively flawlessly as expected. A few things I've noticed, the car doesn't seem to roll as much at Bedford compared to Silverstone, so Anti Roll Bars have been removed from the shopping list for now. Suspension for both track day was set at the 1st click from full stiff. @willclarke said it's very flat round the corners which he didn't expect. Overall I'm happy with the balance of the car, its very neutral, precise and easy to rotate on throttle, making it excellent in the corners.  
My only complaint is with my brake fluid. I'm not happy with how my pedal feels and how soft it gets after a short period. I'm currently using ATE Type 200 which although is track focused, I think I'm going to get something with a higher boiling point.
Here are a couple of photo's from the day:
 

I took my car up to TD to check the mapping hadn't been affected by the new scoop. It had a little and the scoop gave extra headroom for further tweeks giving a nice gain across the board in both power and torque (almost 10 hp and 10 lbft in places). Not bad for a scoop. 

Update 23/02/2019 - Silverstone Trackday
On Thursday I attend a Circuit Days trackday at Silverstone, with several other members of the club. (Special thanks to @VAD17 for organising the day). This would be the first test of my new brake setup, featuring new Rear STi brembo's and Endless pads all-round. I was happy with the performance of the brakes, balance was good, no issues with over heating. Stopping power was the same as the Ferrodo's. I still think I'd prefer something with more of an aggressive bite, however I suspect that would mean sacrificing daily usability. So I might try running a dedicated set of track pads and swapping them out just before the event in future. Overall however they performed flawlessly. 
I'm not sure if it's Silverstone specific but it felt like the car was suffering with too much body roll in some corners, even though I had the suspension set on it's stiffest setting. A set of stiffer ARB's has now been added to my watch list 😆
Overall it was a fun day out with a decent amount of track time, even if it was a little busy on track.
Here are a couple of photo's from the day: