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@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.