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What car? A test pipe is useless unless you are making decent power already. Your car will just be loud as fuck and you will maybe get a tenth or two out of it on a stock SOHC motor.
its a 2000 civic si with a greddy turbo running 8 psi the real reason i posted this is because i have a jackson racing high flow thats begginging to rattle so i was just wanting to know