Quote:
Originally Posted by KmndntKlink
huh, I knew the most restrictive cats were the primaries, didn't think you'd actually LOSE power lol. I agree middle xpipes are extremely cost prohibitive. I could get a really nice used rear for the price of HFC middle.
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You would lose hp going from test pipes to a hfc. Unless you are talking about replacing the secondary cats with a hfc but you will never feel a difference in this change.