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question....
what exactly does an aftermarket muffler do for you...they say on the package that it adds a few hp...is this tru...and i dont see how it works...i see how a catback does cuz its a whole pipe that goes from teh engine rite...but a muffler jsu makes noise rite..cuz i was thinkin of gettin one...and aslo do knn air filters give power or jus sound like a muffler lemme kno i'm new to the performacne field..
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