ok no no and no. im gonna have to disagree. a universal muffler with custom piping. WILL give you modest hp gain. provided that the universal muffler/piping is less restricting than our stock. which it most likely is. mufflers like apexi, hks, and other companies use the same mufflers on all their exhaust systems. so getting a universal apexi with custom piping would be nearly the same thing. you can't get a custom exhaust with a universal apexi muffler and tell me its only for looks and sound. and a cat back exaust might give you more hp. but there are no cat back exhausts for our celicas only way to have a cat back is go custom. i hope i helped a bit.
and i hope by stock piping you're NOT referring to keeping the stock muffler and adding another one (universal) at only the end.
nah haha i just got it done today, its not full custom piping, just after the cat i gto new piping installed with my obx muffler, soundz pretty deep not high pitched at all, ill try to get sound clips tho
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