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Usually stepping the intake down to throttle body size will make more power.
I've even seen 200whp cars gain with 4in piping stepped down to 3.5 then 3 and into a >70mm throttle body.....
Is that how urs is set up ? Also what length is it and do you,use a v stack at,the end.
Mine,is a lil a few mm at most bigger then my q45 and say maybe 2 feel long with a big K&N filter
Stratton.