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I had a Custom Built Exhaust System made for my car and then took the car to Fensport, where Adrian worked his magic on mapping it. My GT86 was the 11th Auto he had mapped at the time and in total had mapped about 50 GT86's. The whole system gave me a power gain of between 25bhp - 30bhp approx and certainly noticed the difference [emoji14] Custom Exhaust System £2,200 Fitted by Bespoke Performance £400 Fensport Mapping License £160 Fensport Maps x3 £450 I would say money well spent [emoji1787] Mileage now 133,105

As with any tuning modification on an NA engine it is expensive for a little gain. Changes the power delivery and makes it much easier to drive which I like. Does it feel faster, not really. Would I do it again, probably as it does make for a nicer drive. I assume from your other comments you may have had a turbo car before. You will never get the cost vs performance gains you get with those cars with these unfortunately.

@Jay Bamrah just to close the loop on the top thread, the EcuTek packages are as follows: ECU License: Usually around £250, this is to allow the ECU to take an EcuTek ROM. The ECU only needs this the 1st time it's flashed, so there may be 2nd hand cars that have this already. Programming Kit (or the BT EVI Kit) with Dongle: The Dongle is the part that allows use of the ProECU software on your PC/Laptop. This is used to flash and log files to the ECU. You do not need this if you're getting tuned by someone else. Needed if you're remote mapping or logging. Can be used to make basic maps for your car and can be used to flash OTS maps if you want. The cable or BT EVI is just the device to connect laptop to the OBD port. RaceROM Upgrade: This is basically a Tuner License lite. It's applied to the dongle and is there to give you greater access to maps, including the custom and RaceROM maps, for self tuning. So this allows you to create better maps, but makes zero difference if you are flashng someone else's maps. https://www.ecutek.com/Products/Retail/ProECU-Programming-Kit/Features/ProECU-BRZ

I bought the Tuning Developments UEL Manifold when there was a sale and had it shipped to me, then fitted the manifold myself (Not an overly difficult job to be honest), and took it to Abbey Motorsports for the EcuTek license + dyno tune. It does save money and is also a good option if you live many many hours away from Tuning Developments.