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You're likely going to learn that 'fine tuning' your exhaust to be 100% optimal for FI costs more than its worth (especially with modest goals), unless you absolutely need to squeeze every ft/lb of output (and every 50rpm of boost threshold/response) from the engine.
You're not going to have a problem reaching a goal of 300whp with any of the aftermarket exhausts that are currently popular and circulating (as most if not all are at least 2.5" diameter), assuming all other supporting mods and turbo selected are up to the task.
IMHO, Just pick a system that appeals to your tastes for design, aesthetics and tone and call it a day.
That said, FYI, incrementally stepping diameter sizes up (2.2" OP, 2.5" FP, 3" CatBack) is exactly backwards in regards to exhaust design with regards to fluid dynamics. That is not to say or imply that swapping to a larger cat back has a negative effect on performance. The internet has plenty of evidence of the contrary. This leads me back to the first line of this post...
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'13 Ultramarine 6MT FR-S || K&N Drop-In, SpeedFactory V1 Cat-Back || Moto-East tuned
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Last edited by AllDayJonRay; 05-11-2014 at 12:04 PM.
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