Quote:
Originally Posted by Gibby1113
I heard a sound clip of a 370 w/ k&ns, stillen ss headers, OEM cats, and nismo cbe and it had a lot of rasp. Not sure if hfc will help the sound or not. Don't know too much about how all that would work together.
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Rasp will be 10 times worse with HFC's if the OEM cats cant stop it.