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Anaxilus - right now I don't have *immediate* throttle response if i'm low in rpms and theres load being emphasized, but my tuning isn't complete yet so I have yet to really put judgment on this area. I know my tuner is working on this so as of right now i'm not too worried unless it can't be fixed, but all signs point to yes as it being able to be figured out.
as far as the piping, its 3" (75mm)