Quote:
Originally Posted by Sledgehammer70
Yes HFC are in the future as the stock cats restrict the hell out of the exhaust.
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Congrats on your new exhaust.
However, I have read a number of comments around here that the stock cats are not very restrictive at all, and that until you're moving a lot of air, ie, forced induction, that the entire stock exhaust flows quite well. This is why people don't see any real HP gains from exhaust mods with these cars, at least while NA. Just sound improvements.