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well the high flow cat is designed to not restrict air as a stock would. Hence the reason why people "gut" the stock cat. not to much in HP gain that I know of maybe w/ T/SC..
I have ahi-flow cat I got a few yrs back to replace another one I got from Egay..but still have the second one for the hell of it and sold my old one, as it was still good.
alot of your major parts retailers will have them but Ebay and some peeps on here can help you out for a good price.... Good luck..
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