I would like to ask regarding how restrictive are the JDM V8 midpipes versus the aftermarket. I have seems some JDM tune vehicle from japan still using the midpipes while only changing the rear muffler section.

JDM midpipes seems to be around 2.5" in diameter. Would these restrict ito to around 350hp?

Would like to test it as the zerosport midpipes n rear muffler have a restrictor in the midpipes and muffler. Was planning on putting the JDM midpipes and a Apexi rear end that came off a tune V8 model from japan.

ANy inputs would be appreciated as since changing these exhaust might make little difference so there is no point in retuning my powerfc on my V3