tegunulgener

It's only the over pipe. Plenty of people will want a catback system and you have the decat pipe as well. i wouldn't really worry about selling them as a job lot. If you can sell the manifold with the overpipe, then I don't see why anyone would be put off by that. Up to you of course.

Are you sure that's a resonated Milltek? Can't see any silencers in the system? Looks like non-res to me. 

I have for sale a Hayward and Scott GT86/BRZ EL 4-2-1 manifold.

 

 

 
I bought it off Teg a couple months back and took it to H&S and got it welded where it had cracked and strengthened. Also had the cat removed as it had become unglued and we weren't sure if it would still be any good.
It also has 6X 1/8" BSP ports for fitting thermocouples, but they come with a bung fitted. 
It has a Cam Coat thermal coating and I have given it a coat of VHT ceramic paint to make it look a bit nicer. 
Item location: Nr Huntingdon, Cambridgeshire
Asking £450 + postage, collection welcome. ono 
Any questions or offer please PM me. Thanks for looking
 
 
 

Link here
Looks kind of cool, and look at that start button  Love the bonnet too. 
 

It's only a car. There are more important things. And there will be other cars. This is coming from a guy who had kids and had to drive a Skoda Fabia Estate for three years Good luck with whatever comes next.
 
 
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It is all related to changes in my life. I am afraid, I had to move this way. Believe me, I am not happy at all. I love the GT86 to the bits. I will come to the meetings as much as I can. 

****Mega long post warning*****
 
So in October, I did something fun and a bit stupid, and finally bit the bullet and bought a Subaru BRZ... this is how it went.

I am not a morning person. This hour of the day was not much fun.

My incredible value train ticket to the nearest station to the dealership in Falkirk (£53!!!)

The Lake District.

Murrayfield, I got excited somewhere around here.
I got picked up from the station in the car, drove it back via their usual test drive route, car was spot on.



Pictures do not do World Rally Blue justice!!! Love the colour. Rear lights need to go, but that can wait.

Met up with Brad off PH Forums who looked round the car for me before I went to get it!
Then I drove the North Coast 500!

Fort William

My new dash (Headunit has to go!)

Just incase I broke my phone!

The view over Helmsdale for my first night!

John o Groats!

Wick Harbour, met up with a mate who works in Wick and lives in Thurso so had a play with his Megane Turbo for the day! Was good fun, alot of torque steer, and surprisingly revvy!

Thurso Beach

An evening in Bettyhill...





My 4 favourite pictures of the entire trip! The scenery of the west Highlands is insane, totally mind blowing.

Lochinver


The ferry terminal and dock at Ullapool

Somewhere near Ullapool!

Looking moody in Carlisle

Total miles from Falkirk to home via NC500 & Fort William!

----------------------------------------------------------------------------------

So one thing I noticed a day or so into my trip was the brakes were pretty terrible. Plenty of meat on the pads but no bite at all.
Closer investigation and i found Jurid marked on the fronts. Cheap pads from Euros or wherever.
A little asking around on the GT86/BRZ Driver's Facebook page and I bought and fitted these:



Performance Friction fronts and Yellowstuff rears.

In Derby this week...
It's going to a local detailer to clean 1500 miles of grime off and seal it for winter on Saturday, so more pictures then!
Next up is swap a set of wheels off my Fabia over onto it for winter, and my personal plate, then save for an exhaust and some TOMs rear lights.
-------------------------------------------------------------------------------------------------------------

Just had it de-swirled and it looks incredible!
Pictures:




Can't believe the difference, even on a 3yr old car.
This thing is also making me reconsider my collection of toys...
------------------------------------------------------------------------------------------------------------------------
Swapped my spare wheels over end Nov;



Really like the Gunmetal against the Blue, but next pair of tyres can be bigger than the 205/40/17 on there now.
Also the Rainsport3s are much nicer to use than the awful standard tyres on greasy roads!
----------------------------------------------------------------------------------------------------------------------
KW Coilovers and Superpro rear lower arms and toe arms on!

With a proper alignment, the car is on rails! Very pleased!
I also took it round Wales for 4 days!
Black Mountain pass:

My hotel for the first night:


Some awesome metal in the carpark!:



Day 2, Rhyader mountain pass:

And elsewhere:

Stayed in Portmeirion:




Also went into Caernarfon that night:

Day 3 Snowdonia and Denbeigh:

And day 4 I didn't grab many pictures at all.
...but I did collect a Perrin stainless 3" cat back

Which sounds cracking even with the rest of the OEM system.
Next up is 18s and a head unit I think, then those awful rear lights sorted!
-------------------------------------------------------------------------------------------------------------------
We're pretty much upto date!
I bought 3x 18s off somebody local and ordered the 4th, so pictures when they are on, as i was sick of scraping everything on 17s and tiny tyres.
 
 
 
 

I've been meaning to post some pic of my audio install. Rather than write an essay I will be brief with lots of pictures.
Aim of the system was light and competition level sound quality. I used CLD, Egg box foam and 3M thinsulate to sound deaden. The latter two are very very light. I added 6kg of CLD total.
I decided pretty quickly to have a front and sub with a fully active setup. Pioneer Headunit with DSP and crossovers built in and 3 amplifiers; a two channel for tweeters, a two channel for mid/bass and a single channel for sub. The two front amps fit under the drivers and passenger seat. The sub amp goes in the back mounted to the sub box on isolation feet.
Doors were damped with CLD, sealed to make air tight as possible and foamed to prevent rattles. Speakers mounted on MDF baffles treated to seal them from water damage. 
I also added sound deadening to rear arches which made a world of difference. 
System Spec
DEH-80PRS Headunit Genesis Profile 2 for Tweeters (under passenger seat) Genesis Profile 4 bridged to drive the mid/bass (Under Driver Seat) Genesis Profile Sub for the Sub (boot) Morel Virtus 602 component fronts Peerless XLS 10 4ohm subwoofer Van Damme Pro Audio Blue Speaker Cable (2.5mm for mid/bass and Sub, 1.5mm for tweeters) Van Damme Pro Audio Instrument cable with Brass Gold plated RCA connetors CCA 4AWG and 8AWG power cable  
Here is a ton of pictures. 
The headunit



Dash in pieces fitting the Microphone for the bluetooth phone calls.

Surround was glued together and covered

Filled




 
Next up - The Battery
Installed an AGM battery for better voltage regulation



 
The Doors
Damped with CLD and added some Egg box foam inside

Sealed to make as air tight as possible

Whole door covered in closed cell foam

Speaker baffle with acoustic foam to protect the back of the speaker from water

behind the speaker


Tweeter in the dash

The Amps
I forgot to take a pic of the passenger side but here is the drivers side for the mid bass (its bridged Genesis Profile 4)


 
The Sub
Sub enclosure is a hybrid MDF and Fiberglass molded to the base of the boot and bolted down using the spare wheel anchor and screwed to a bit of MDF glue the panel at the back.
Sizing it up

ready to fibreglass

curing

Made the top and test fitted the sub and Grill

covered

amp mounted on isolation supports

installed in car



 
Finally some addition sound deadening to block some road noise
Layer of CLD to reduce panel resonance

and two layer of 3M thinsulate

This is the best place to start with sound deadening. Reduced road noise massively. 
 
So there it is. Hope you like it. Any questions please ask away.
Cheers 

Hi guys, 
After being a part of this forum for over 12 months and seeing all of the amazing cars you guys have built, gaining knowledge and inspiration along the way. I feel it's time I should start a record of my progress on my own car. I've held back until now, simply because I felt my progress would be too slow and would not do the rest of the builds on the forum justice. There really are some amazing examples on here. 
I hope you all enjoy the read! 
Knighty's 86 Build Thread
 
It all started in January 2016 when I found the 86 at a local car supermarket, it was a 64 plate, with 5000 miles on the clock, after looking on the market for an 86 for some time I realised this car was offered at a great price for the spec, Ideally I was first looking for a white or dare I say it, ginger model . But I love red cars and when I saw it I just had to have it, a deposit was placed, I test drove it a week later, and picked it up the following day, sadly leaving behind my beautiful 7th generation Celica GT. 


It only took a few weeks before I added my first modification, which was much needed in my opinion...

Toyota OEM armrest. Having somewhere to put your arm that isn't in the cupholder improved things no end! Also added an 86 plaque for the heated seat switch surround.

Next up, not really a modification, I applied my personal plate to the car, and bought some 3D gel resin number plates from Demonplates. these number plates are really nice quality, with the lettering mounted onto the plate, rather than part of the reflective backing.

Carbon fibre is one of my favourite materials to look at, and I soon found that a whole host of interior trim pieces were available to give a nice premium look. I started with the steering wheel piece.


I then added the door handle trims


There's still a lot of carbon trim left to buy, but hopefully I'll get round to it at some point!
The car stayed like this for a few months before I treated myself for my birthday to something I'd been wanting for a while.



Cobra Sport resonated exhaust. The sound of this still makes me smile even now, wakes the car up so much! just what was needed!
Around the same time I treated the car to its first proper detail...
This consisted of;
Snow Foam
Shampoo wash
Clay Bar 
Machine Polish (Light polish) 
Paint Sealant
Wax 
Below are some of the after shots



After this the car was just enjoyed for the rest of the year, I took it out on drives through the peak district, snake pass and so on;  






The day at snake pass was absolutely awesome! Gorgeous sunshine, open road, the 86 and just me, myself and I. I feel like a club outing into the peaks could be an amazing idea, however it does tend to get very busy with cyclists and the like, so might not be suitable! 
Next day out was a trip to Blyton with the club. The first time I got to meet many of you! Many thanks for the warm welcome and making me feel at home! Got some awesome passenger laps with you all! 


Then finally onto JAE, my first year at the show and had such a great time! Again thankyou to everyone who made me feel welcome! 



Before JAE I was undecided on what to do with the 86. I wanted to lower it, but was unsure of the best way to go about it. At first I thought springs would be the way to go, but after a bit of research and talking to other members. I decided that springs wouldn't give me what I was looking for, and so I turned to the trusted brand TEIN. 
I ordered a set of TEIN Flex A coilovers with Amber Performance, and after a long wait, they arrived for me at work! 

I then had to decide on what camber adjustment I'd like for the rear of the car, again the wealth of information on the forum saved me, and I opted to go for a set of summit/Swave rear arms. Really nice quality and a great price again from Amber performance. 

I had a set of 17 x 8.5 Japan Racing JR3 alloys wrapped in Toyo T1R tyres left over from the Celica build and decided to make use of them, installing them on a stock height car I was a little unsure. 
Before 

After 

I ended up really liking them on the car after a while and thought the machined look, really hit a nice contrast with the paint. They looked a little small in the arches, but I decided to see how they looked when the arch gap was removed. 
Finally after a few months, the faithful day arrived on Friday the 24th February. The car was booked in with Mike at Tuning Developments to have both the coilovers and rear arms installed, along with a fast road alignment. To say I was looking forward to it was an understatement.
When I picked the car up. I wasn't disappointed. 
This is how the car currently sits


This has just transformed the car. You don't truly appreciate just how high the 86 sits on stock suspension until you see it lowered. I absolutely love it, and the wheels look so much better now the arch gap has been removed. 
The intention was always to purchase a new set of wheels for the car, but I'm quite happy to keep these on for a while.
So far I'm extremely impressed with how good the ride quality is on the TEIN suspension. I currently have it set to full stiff all round, but I'll start to make some adjustments soon.
The car also feels so much more responsive with the alignment setup.
And so this brings me up to the point the car is currently at. To everyone that helped and gave me advice up to this point a huge thankyou is in order. I appreciate everyones help! Hopefully I can keep making steady progress with this thread as time goes on. There is still a lot of things I have in mind for it!
Until next time!  

Hey guys!
 
I just thought I'd make a new little discussion about the exhaust I've recently had fitted to my 86!
 
It's completely changed the driving experience of the car!
 
I'll be making another, better video in the future with more angles & better camera equipment once the exhaust has properly bedded in. 
It's actually louder now than when it was first installed, as the carbon has built up a bit. 
 
Enjoy this video for now, plenty more videos to come to my channel
 
-Jordz

As some of you know I acquired a BBK kit from TAROX late last year for evaluation purposes. A stint of illnesses and other bits and bobs mean't that I got the kit fitted on just before the new year. Now that I've had it on for some time and have a trackday under my belt with them I can provide a well enough review to you all on the brakes and rotors.
So the kit they gave me was the 328mm Sport Compact brake kit which consists of the following
Red 6 pot TAROX Calipers, discs, pads and hardware to mount to the car. Braided hoses and all the nuts & bolts and boring bits!
Packaging was well enough! The box came with a dent in it but nothing was damaged and the whole kit was packed well enough to prevent and scratches or chips to the calipers. Being in one large box it obviously weighed a fair bit! Also came with a complimentary lanyard of course and a small booklet of all their kits.

 

Disc used is their F2000 single piece, obviously many think the grooves are pointless but lets not get in to a debate about them here!

 
Their website states that their Sport Compact kit comes with the B280-6 or B30-6 Calipers usually. However the below suggests otherwise with the B32-6 Calipers instead. 
The one thing I do need to clarify with TAROX is what pad is used in the kit and I will post that up shortly when I get a response
Drawings of the Caliper can be found here: http://en.tarox.com/wp-content/uploads/2015/08/B32-6.pdf
Piston number
Disc Ø (min-max)
Disc thickness (min-max)
Disc Depth
Weight
Mounting Type
Lug offset
Minimum internal wheel Ø
Lug PCD
Knockoff Piston
Mounting Centres
Piston Layout (Diameter in mm)
Total area (both sides) cm²
Piston Layout (Diameter in mm)
Total area (both sides) cm²
Piston Layout (Diameter in mm)
Total area (both sides) cm²
Pad Code
Pad Area
Pad Choice
Pad Thickness
Pad Depth
6
290-330mm
10-30mm
60mm
2.2 kg
Lug
N/A
N/A
N/A
Optional
89mm
26/31/26
363
26/34/26
394
31/34/31
483
SP0239
80 cm²
.114/.501./116/.601
17mm
60mm

Daily Driving Usage
As a daily driver, I was sceptical about putting a BBK on as I didn't want all brake and nothing else, I didn't want the Girlfriends head flying through the windscreen whenever I approached a set of lights!
Safe to say that in these respects the brakes are probably somewhat tamer than the brakes they replaced which were DIXCEL ES Discs & Z Type Pads. The TAROX has a lesser initial bite and seem more progressive, i'm guessing these pads work better with a bit of heat in them (more on that later). The pedal feel however is improved with the braided lines and overall braking performance is definitely not decreased. They stop well in day to day traffic and handle fast road work just fine. Do not squeak which is an advantage. Dusting on the brakes is probably somewhat less than the DIXCEL pads but ultimately this isn't something that i particularly factor in when looking at a kit, if some of you do, they will dust more than stock but I guess lesser than some pads out there. 
Track Use
Hopefully one of many trackdays to test the brakes out I was at brands hatch in January to give them a better test, slightly hampered by both the weather and the black flag I incurred (not through my poor driving I might add) but never the less a good day.
As suspected the lesser initial bite was seemingly due to the pads working once they had a bit of heat in them. Probably more for the track biased then, but by no means a death trap on the road. It's worth noting i'm not 100% sure what pad it is. I shall find out for all though. 
They stopped well enough, it's all I can really say as they didn't particularly feel any better than my old discs and pads as the ABS would just kick in as it was an extremely wet and greasy track. I need to pencil myself in for a dry day clearly to compare properly. Brake fade was non existent, it wasn't on my previous discs and pads either but what I can say is they are an improvement over stock.
I'll give them another test in May and see how they do for now though, overall i'm happy with the performance of the kit and would recommend it, it's not the cheapest of BBK out there, but it's certainly not the most expensive.


 

Well, as there are clearly still some questions, I'll try and take some time to do some testing while I'm in the car.
Step 1: Sound deadening. This is the cheapest and easiest mod, and realistically should make a noticeable difference.
Step 2: Fit the amp with stock speakers.
Step 3: Swap out the speakers for the new Focal items.
To answer a question I glossed over, yes, the head unit will end up getting changed, just need to find something OEM looking with good navigation software, DAB etc. and I'll pick one up. As I said initially, this is just something that's been bugging me since I bought the car, and shouldn't be too expensive or difficult to improve.
At the end of the day, a car will never be a match for listening to music at home, and that's why I've invested well into four figures on my home audio setup, but for the times I am listening to music in the car, I'd like to at least enjoy it, not have some distorted, completely flat version of my favourite songs

I'm pretty new to this forum but have been a GT86 owner for a couple of years now. Our company GT86 is undergoing changes to make it a little more track orientated. The standard car is excellent as a day to day car, but we wanted to make it a little tighter, handle a little better and go a bit better.
Here are a few pics of the work we've done so far. It started off completely standard - the first thing we did was to fit some Ohlins suspension. This probably wouldn't have been the first modification I'd usually carry out but we got them with the car and couldn't resist trying them out.

Handled well on track:


Next up was to tune the car with ECUTek - quite a complicated engine with variable in/ex cams, port and direct injection - so plenty to play with.
Managed to get a a few more powers - this was on a completely standard car, with no hardware changes.

To tighten up the suspension a little we opted to go for a full superpro kit - we've been using these on the 350Z and 370Z for years and it transforms the feel of the car






Love the Superpro finish and quality - much better than most. Hopefully will stay looking good.
We've also experimented with decat pipes, EL headers and inlet plenum spacers - all giving positive results after the necessary ECU tweeks.
And finally, where we are now - about three quarters of the way through a turbo conversion:

Mapping to follow - hopefully it'll liven things up a bit. Just hope the roads dry out soon...

Charlie picked up the car today to take it back to Sheffield to get the exhaust right as there's still some minor issues with it.
But before that I managed to finish off my false floor for the boot. With my sub mounted at the side of the boot and the EDFC motors it always proved tricky to get the boot lining out to reach underneath.
It now looks like this

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My Custom Hayward and Scott Cat-Back Design and Proving
 
Introduction
 
**If you don't want to read at the theory, skip to the end where there are pretty pictures and a video**
 
Firstly I should point out that I am a bit of an old man and dont like noisy exhausts! LOL. Please dont take any of the following as a criticism to any aftermarket exhaust; I just wanted something that is quiet under full throttle until higher up in the revs. This then gives me some headroom to further modify the exhaust.
My current exhaust, the Cosworth Cat Back, measures 92dB supercharged or 89dB N/A, so not particularly loud but when cruising on the motorway, 6th Gear, 3k rpms and going wide open throttle, I found it to be very boomy in the cabin when it was hot, particularly after a track day. Even with cruise control on when coming to a hill, the slight throttle was enough to annoy me on longer drives which are becoming more and more often in my GT86 these days. How on earth some of you live with 100dB exhausts is beyond me!
Its not a criticism of the Cosworth cat back; I still think it sounds awesome and I haven't come across any other cat back for this car that is quiet when under WOT at low revs either, apart from stock. Certainly it's not any worse on the Cosworth 0.1 than other exhausts I have sampled in the 92dB range.
Silencer Theory
 
Straight though absorption silencers used in most aftermarket exhausts dont attenuate sound very well at low frequencies. It depends on the length, volume and packing material but generally they dont block as well at lower revs as they do the higher.
The reason for using these silencers is that they dont restrict flow like a cambered silencer (stock).
I decided to do a bit more research into OEM silencers and how they work. It turns out that a stock silencer typically has two or more chambers inside but each chamber often has a different target frequency range.
I am not going to get into detail but here is a diagram of a typical 3 chamber silencer. Each chamber is a different design targeting different frequency ranges. 

And here is the insertion loss of the different straight silencer types:

The tuned pipe, otherwise known as a branch resonator or sometimes mistakenly called a Helmholtz resonator is quite a popular DIY for helping drone.  Its length is designed to reflect sound waves 180 degrees out of phase at the target frequency. The result is noise cancellation but the Q is quite high so it doesnt have a very wide range.
At the target frequency of 100Hz and 150C gas temperature, the pipe would need to be about a meter long! Here is one such example (borrowed from the ft86club):

I had noticed that some Cat Backs do have Helmholtz resonators, namely the ARK Grip and HKS HI Power Spec L. I havent heard either to comment other than to say, looking at my calculations and the images, it looks to me like they dont target 100Hz as the cambers are a bit small and both seem a bit loud for my goal.
The Helmholtz does look appealing though, as it has a lower Q, so wider attenuation range and the packaging is much nicer requiring a big air chamber and a neck, bit like a bottle.
Hayward and Scott
I decided to speak to Ian at Hayward and Scott about a custom Exhaust as I have always been impressed with their work. Originally I asked Ian to make me a large single absorption silencer like the Q300 or Miltek but to connect up to the 3inch Cosworth mid pipe. The intension here was to add additional resonators in the front or mid pipe if it was still too boomy at low revs.
After some discussion with Ian I decided that it was better to start with a whole new cat back rather than chop up the current one as Ian was sure he could get a much larger center silencer in the tunnel.
We decided 70mm (2.75inch) pipe would be a good compromise and we should keep the Y design as it has the best flow. He also explained that they have a small chamber built into their silencers too which may help, so I left the car with them for a week while they made the system.
Here are some pictures of the finished product:




Ian has a catalog of exhaust tips but I liked a twin wall rolled and these with the perforated inner did the trick. Actually, originally I said I wanted a design similar to the Cosworth/Nameless/Perrin but Ian fitted the rolled and I decided to keep them when I saw how nice they look. Ian knows best! J
The results were very good. Much quieter and a pleasing rumble, however on the drive home I wasnt quite happy with the 3k rpms WOT boom. Although far quieter than before, I wanted even less, but the top end was perfect.
Helmholtz Design
 
I decided to look in detail at a Helmholtz resonator design.
First port of call was Wiki!
https://en.wikipedia.org/wiki/Helmholtz_resonance
Next I made a spreadsheet to calculate the required volume and neck lengths from the formula on the wiki page. At this point I want to thank the few engineers; Frederik, Dan and Matt who checked my sums weren't completely wrong!
Also another good reference was a paper discussing using the muffling effect of Helmholtz Attachments to a gas flow path
http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2200&context=icec
I decided to copy the ARK style arrangement, with two Helmholtz resonators mounted in parallel to the rear silencers as this was the area under the car with the most space. Also two would work better than one. They would be quite a bit bigger than the ARK design though, targeting 100Hz.
Once I was happy with the design on paper I made a mock up from cardboard and plastic pipe to check it could fit where I had space.
The only real issue going forward that was highlighted could have been if I got the gas temperature wrong, as I had used a thermocouple in the exhaust pipe which wasn’t right at the point the resonators would attach. I measured 150C which I though was realistic near the back boxes.
So back on the phone to Ian at H&S to get the Helmholtz chambers made up and welded on the existing pipework. Ian managed to tuck them up a bit so from behind you still see the nice H&S boxes
Here are some pictures. I think it looks awesome!




The result is a reduced 2-4krpms noise and just a nice background rumble when WOT @3Krpms.  And to show the effect of the Helmholtz here is a graph of before and after:

There is about a 10dB reduction downwards of about 100Hz (3k rpms) which equates to sounding about half the volume. In terms of how it feels, the noise power is 10 times less!
Finally a little sound clip
 
Final Specs are:
·         When hot 83-85dB @5k rpms (45degree, 1Meter), though at Bedford they told me it was 79dB.  If you N/A reduce this by about 3dB.
·         70mm internal pipe diameter splitting to 2x50mm pipes
·         Low level hum when WOT at 2k-3.5k opening up to a nice refined tone above 4k
·         Y design for a smooth gas flow
·         Stainless steel with a lifetime warranty (check website for terms and conditions or talk to Ian)
·         UK made
·         Personal touch being able to select from a range of exhaust tips
Well thats just about it. This was much longer than I intended but I am very happy with the results and wanted to share my findings.
Thanks to Ian for his craftsmanship and help designing this amazing cat back, and also for his quick responses to my emails over the last 3 months! I cannot recommend highly enough.
H&S also do a selection of 2.5inch options with different middle silencers (or none at all) that are worth a look.
https://www.haywardandscott.com/toyota-gt86.html
If anyone has any questions, do feel free to ask away. 
**edit - added pricing**
So pricing looks like this:
Cat-Back with 70mm piping and the extra larger center silencer £650 + VAT  Exhaust Tips of your choice: Varies but roughtly ~£75+VAT Helmholtz Resonators: £275+VAT Above priced are fitted. 
ease note this system differs from their standard offerings in that it has 70mm pipe diameter and the extra larger middle box is bigger than their "larger center silencer" on their website. 
If in doubt talk to Ian at H&S about your needs.
 

The 4-1 design we fitted to Rob's car was designed for more top end driving, the lengths and diameters are tuned to give a bigger increase in the higher RPM band as the car already has plenty of low-end torque and Rob agreed that this would be the best option.
Just to clear a few things up;
We can design a 4-1 system to give a bigger advantage at a low-mid rpm by tuning the lengths and diameters it's not strictly true that a 4-1 system only increases top-end. A 4-1 manifold will give much bigger increase at one RPM point compared to a 4-2-1 which would give a milder performance increase at two separate rpm points so essentially across a wider RPM band.
You can tune 4-2-1 systems or stepped manifolds for high-end power too, but the increase is milder and across a slightly wider RPM band and generally not seen as advantageous on the road compared to a 4-1 manifold.
By running equal length primaries, you will also get a lift across the entire torque band too, as well as the RPM point where the lengths and diameters are tuned for unlike and un-equal length manifold, and with more effect than a 4-2-1 manifold.
The most important part really is the collector, this determines how much everything lifts by and how effective the primaries are, without a well designed collector, everything else is pointless (this is where most other manifold designers and manufacturers neglect).
Hope this was helpful and any other queries don't hesitate to ask away

4-1 tends to lend itself to higher RPM performance due to runner length. With a PD blower I would suggest that a 4-1 is preferable as you don't need a manifold to produce the low-to-mid range torque. As with any manifold it's in the design, runner length and diameter play far more a part than how many collectors it has.
Whether it suits the Sprintex is another thing, we all know that the torque curve drops off at higher RPM a bit like stock. If this is not due to the exhaust then it won't benefit that much. Hopefully CGR have done some real exhaust CFM calculations to get the specs right for what Rob wants.

Nik, I believe they can be wired to operate as a brake light, but don't know if you have to change any connections within the lamp itself.  Some guys in USA have had to fiddle with the internals, but I believe their light combinations operate differently anyway due to US law.

@Bfranklyn86 No, initially I was going to but the Cobra HFC in but then just went with them putting their own HFC in. It's pricey, but it's a bit of a work of art, it's not a Japspeed manifold at the end of the dayl... Picture of it finished, i'm too excited to get some figures out of it.

Little update, exhaust is obviously fitted. Overpipe was slightly catching the subframe but CGR made a new overpipe no problem and I went up and had that fitted this weekend. Exhaust sounds much better now it doesn't rattle  Booked in for some dyno time and alignment with @Mark@Abbey M/S for 20th in preparation for my Brands Hatch outing on 27th!
Brakes were also fitted before christmas but due to me being ill/drunk and the car being filthy couples with it getting dark too early i've struggled to get pics. Washed the car and took some earlier though! 


 

Here's another video from my friend Lee for day 2:
 
And I've FINALLY started on my videos so here's the first one:
However this was the easy one, the others will take a lil longer as there's a lot more footage and a lot more to see so it might take me a while to sift through them all and then compile something from it.
 

When Faith, Mike, Chris and Rich decided to do a Scotland trip, I was gutted I couldn't join them earlier this year. Shortly after, another friend of mine said that him and his mates were going to do something similar, once again I was unable to attend, but then when another group of mates said that they were going to this trip during the same week I had already booked off for a wedding up north, this worked out beautifully.
A massive thanks to my friends Paul and Lee for inviting me to join them in their Scotland North Coast 500 run, Paul in his amazing BMW 1M Coupe and Lee in his awesome pocket rocket Ford Fiesta ST. The weather was on and off but it always held out when we were on the nice fast and twisty roads.

We started off in Leamington Spa and drove up in convoy up to Dumbarton on the Sunday. The following morning we headed up to Inverness but we took a quick detour around to Stronachlachar Pier, which took a while due to the very tight and bumpy one track lanes but the views were worth it, we then made the mistake of driving over to the opposite side to Inversnaid, the roads were still tight and there wasn't a lot to see when we got there (literally just turned around and headed back) but it was nice to drive along side the loch. We then continued up towards Inverness while coming across some awesomely tight and twisty roads along the way, some up hill hair pins to boot. We even stopped part way through at the Dalwhinnie Distillery for a quick tour which was interesting. The rest of the way was just single to dual carriageways.
The next day we ventured from Inverness to Ullapool via the north coast of Scotland, this time round it was a combination of single track lanes with plenty of over taking areas and fast sweeping corners, a much faster pace that then day before but it was still a good 7 hour journey. We stopped part way through at John O'Groats for a spot of lunch and pics before we carried on. We made another stop later on so I could swap over my SD cards from my dash cams while giving Paul some well deserved rest after a sleepless night from some sort of food poisoning the night before.....haggis stuffed chicken anyone? I also discovered a stowaway when we stopped, luckily the car had already dealt with it and decided to eat it, I was warned about the sheep on the road but luckily none of them were feeling suicidal....sadly I couldn't say the same about the birds, there was loads of them flying low down past the front of my car for some reason....luckily the poor one in the picture didn't cause any damage to the car.

The next day was an even longer day, we continued around the coast driving from Ullapool via Applecross, then cutting across back to Inverness and then down pass Loch Ness past For Williams before arriving back in Dumbarton. The reason for the major detour was even before we began the journey, we knew petrol could be a problem, being religious users of Shell V-Power we had to tactically choose out routes based on where the Shell garages were....however once you went past Inverness, you were crap out of luck of Shell garages so we had to make do with any petrol station with super unleaded.....sadly there wasn't that many around either, so after leaving Ullapool, we wouldn't have been able to make it to Dumbarton so we had to take a detour back to Inverness to refuel in order to make it back to Dumbarton. This meant going down the Applecross pass which in pictures looks amazing, steep twisty turns and hair pins...but in reality it was a nightmare, proper steep drops with very very narrow roads. We had to creep down and constantly stop in very small overtaking spots....and with old geezers not knowing how big their cars were, we got into a pickle at one point....wouldn't want to tackle that again....just glad we were doing down and not up it. The rest of the roads were awesome, during the last stretch, we went high up into the mountains where there was a lot of mist, really moody atmospheric settings with really fast of open roads.....very fast.

On the last day (Thursday), we had a bit of a lie in before the long journey home, however for myself, it was just another journey to be had, I had to make my way down to Halifax for my mates wedding so rather than taking the boring motorway down, I departed from the convoy down near Carisle to tackle some of the back roads through the lake district, some nice roads and pretty scenery there but not really an idea location for driving enthusiasts as most of the roads were 40mph for no apparent reason and the roads were just full of really slow ass drivers. Managed to find a couple of nice twisty roads but not a lot.

All in all a very long and exhausting week, each night I was always out cold, one night I tried to get comfy in bed first before I turned everything off to go to sleep however as soon as my head hit the pillow I was out cold, the next night, after having a shower, I sat down, had a look at my phone, closed my eyes and the next time I opened them again, it was 2:30 in the morning.....I was still sat there stark naked. The roads were awesome but some of it did drag on a bit, think we needed to take more breaks or visit more set locations, to my understanding, the North Coast 500 should normally be done over 4-5 days, we did it in 3 so that's pretty impressive....but very tiring. I'd definitely be up for something like this again, I'm sure there are more awesome roads to be discovered but at the same time, bring on some Euro trips!  I've got about 300GB of footage to sieve through (footage from my front dash cam as well as nabbing my sister's dash cam to point backwards) so videos to follow at some point but in the mean time, here are some pics I tool.
 

From Wikipedia...
"Toyota 86 in Asia, South Africa, North America (from August 2016), South America and Australia;[1] GT86 in Europe; both of the preceding names in New Zealand; FT86 in Nicaragua and Jamaica;".
...and Thailand apparently...
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Hey people... I fixed it. It was really a silly thing but it's always better to be cautious than sorry, isn't it?
There are 4 screws on the sensor piece attached to the intake manifold. All were loose. Tightened them up and VIOLA! Noise has gone. I wonder why the screws (4 of them) were lose?
Thank you one more time for your concerns. 

I will do now. thank you nik