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yeah maybe SOME people occasionally. the shop i deal with (put the kenne bell on greg biffles gt500) said he has seen gains with the 75mm tb/plenum even on stockish cars (bolt on). he has been in the business a long time and built many many sick cars..Honestly people have even lost power with bigger throttle body and plenums on N/A cars. It will serve up a bigger gain on FI applications. Not saying you shouldn't be building a foundation ahead of time though![]()
and op, def. doesn't sound right...not that much of a gain at all. they do help but nowhere near that much. just a few hp and tq IMO