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for FI you will want the straightest, most free-flowing exhaust out there, preferably 3" in diameter.. Freed engineerings exhaust looks like the best as of yet, as well as the SRT catback.
Also to people who say a certain diameter exhaust is not a restriction, you never know what HP you can gain until you actually switch to a larger diameter exhaust.. So when xxxx tuner says 2.5" is not a restriction, that's just because they haven't tested a 3" back to back.. To my knowledge there isn't a 3" exhaust out yet for this car, feel free to prove me wrong if I missed it..
Again this is all related to a turbo FA20..
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