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I agree with some/most of the bits Will is saying but I will add a few (try to be non biased) to that. Design c. I am not aware of anyone needing to cut a section, but yes you may need to put a small dent using a ball peen hammer. Design e. Due to it compactness the intake runner lengths are not tuned properly. They are too short. This is one of the reasons why the Cosworth running 0.5bar makes the same power as the harrop running 0.7bar boost. The other reason is the bigger more draggy TVS and the tuning to balance cylinder pressure which can only be done with incylinder pressure sensors (standard tunnig with OEMs and serious motorsport). Performance e. Its a fair point the most powerful Cosworth is their dev car running ~330hp. However, I am not aware of high power 400hp harrops that use pump gas? All E85 which help massively with high IATs. General advice I see is 12psi max on pump and you need E85 if you go for more boost due to heat and pulling timing. Cooling: Yes at 280hp both are fine, but running high power is where is were the nearly twice as good cooling (Coswroth is +15iat, harrop +25iat, Edlebrock +30iat) would come into it. Where the Cosworth could be +35iat @400hp, the Harrop will be +60C and the Edblebrock +70C. Tuning: Here is my main disagreement. The Cosworth was tuned on an engine dyno and it specific to that kit. You cant take things Matt has done differently with their SC kit and apply them to the other kits. Its not just the engine dyno tuning either, they use widebands in every exhaust runner, and cylinder pressure sensors to properly dial in each cylinder and evaluate things like how well the stock knock sensor work ect.. Its a different kettle of fish. Tuner dont typically use widebands and thermocouples in each cylinder runner, they just poke a wideband sensor up the exhaust. They certainly cant measure cylinder pressure and balance them out or evaluate if the knock sensor is doing a good job or not. For me the defining decision to go Cosworth was the tuning. Yes most people are happy with dyno or road tuning but for me I wanted the real deal OEM engineered solution. If I were choosing now, I would be on the fence a bit for some of the reasons Will has given and the fact that Cosworth are getting out of the game. Matt@cosworth still gives excellent support and he isnt likely to leave Cosworth any time soon as he is very well respected there, but you never know....

Update 27/08/19 - Bedford Trackday Another trackday at Bedford, this was pretty much the same as the one on the 22nd July, with 30°c heat. I was trying to find a good tyre pressure balance to limit the amount of sliding after an extended period. It felt like I only really got one good sessions at about 3:30 in the afternoon, when everyone had left and the track was basically empty (driving standards were abit hit and miss during the day). Still I was impressed with how the tyres held up and the amount of grip they provide. I was concerned when looking for a more track focused tyre that it might over tyre the car, for my level of driving. However after a couple of days I'm now happy with the balance and control provided by the tyre. It's definitely a good purchase for someone looking for a dual duty tyre with a more track focused bias. In general driving they a comfortable, quiet and I've had no issues driving in the rain with them. Unfortunately the day wasn't completely without issue, when going for fuel during the lunch break I noticed the car sounded alot louder than normal, on returning back to the circuit and checking the car over I found that the exhaust had cracked and was blowing quite badly 😟 knowing that I still had the afternoon and another trackday two days later, I decided to just carry on (more later). Here's a couple of photo's from the trackday: (I didn't kill the cone, honest)

Event Title: GT86/ BRZ Breakfast @ Denbies Event Author: VAD17 Event Date: 03.11.2019 Lets have a breakfast meet at Denbies Sunday, November 3rd Start 9:30 am Denbies Wine Estate London Road, Dorking, RH5 6AA https://www.denbies.co.uk/finding-us/ Plan is to have a chit chat, go for a breakfast and if anyone wants they can book a tour or do Christmas wine shopping. Once we have numbers confirmed I will ask Denbies to reserve parking space for us. Hope the date works, but please shout if later in November would work better. Attendees: 1. @VAD17 +1 (organizer) 2. @Rich196 3. @Leevsfortyone 4. @Rocket Panda 5. @Luke 6. @SimonG68 7. @MartinT 8. @The Minion 9. @CherryBomb GT86/ BRZ Breakfast @ Denbies

Nope and you'll love it. It just feels like a 3 litre FA20.

I've now spoken with Mark at Abbey Motorsport and he has been very helpful, answering my questions and sending me a quote by return. I need to do some logistics planning but I'm now looking at the Harrop as my potential solution. It all fits in with my use as a daily car, for road use only, mindful of a very progressive feel especially in the wet and the snow, near OEM installation looks and fairly quiet, making great use of the TD manifold and catback exhaust and HKS intake duct, retaining the stock 2nd cat, limiting the maximum torque in the map to preserve the engine and enjoying the charger's big engine feel. Have I missed anything?

Still loving mine too after all this time and one year on having the "Harry Haddock" mobile all to myself

Exactly that. I've had my BRZ dyno tuned on every major mod and there is no real substitute, compared with base maps that don't quite match your car.

I got them for ATS Euromaster, however that was when they had money off Yokohama tyres and 10% fitting, so got an exceptionally good price. They are cheaper on Camskill now.

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When you get to that level of modification and investment it just makes more sense to buy a faster car in the first place. 280bhp is the sweet spot, that's about 225bhp per ton which is perfect for a road car, after driving Abbeys Harrop charged car around Oxted it definitely doesn't need any extra, more than enough. In my opinion of course.

Put me dwon, I should be able to make this

I wouldn't part from my Cosworth charger, after having to make a similar choice. I fitted it myself about 6 months ago and and from an engineering point of view, it's very good indeed. Very good support too.

I was speaking to a trader a couple of weeks ago about a number of things, including supercharging. He then informed me that Cosworth only have 8 supercharger kits left available in the UK. When I go FI it'll most likely be the Harrop (there are a number of reasons why I prefer it over the Cosworth), for those that are interested your are looking at just under £6k fully fitted and mapped (including new engine oil) for the Harrop from Abbey.

Four year on 27 September 👍. Still love her to bits. Let hubby chauffeur me today, so jealous, lovely roads as we are on a mini road trip. Enjoy miles of smiles 😁

GT86 owner + 4 days = 😁