If you don't want loud DO NOT get a straight through muffler... you want an oval style baffled muffler... AND a resonator...
I thought thermals where the canister style mufflers with NO resonator... and the straight pipes...
The quitest exhaust will be:
shaped like the stock ones (not the long straight tubes like N1 etc)
Have a GOOD sized resonator... not a little glass-pack looking thing.
have an OVAL muffler... that is baffled... the more the quiter...
Canister style mufflers will get louder and louder the smaller they are... the straighter the piping the louder it will be... the smaller the resonator the louder it will be.
I have a brosal brospeed catback now... it's not loud at all compared to most aftermarket exhausts... but it's louder than stock for sure.
I'm PRETTY sure you could get a stock acura integra exhaust.. it'd flow a little better than your stocker and probobly be a little louder but not much.
Proboboly not too many gains there though (although no exhaust is really going to give you serious gains... and if it does it'll be one of those fartcans with straight piping.)
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I am an A$$hole... take anything I say to heart at YOUR OWN RISK...
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