Quote:
Originally Posted by Gibby1113
I don't know if this is a stupid question or not but is there a hfc that won't give my car a hiss when I rev it? I know the sound of the exhaust will change I just don't want it to hiss.
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It's not the cat that gives it that hiss. It's kinda just how the motor sounds. It's almost unavoidable with HFCs or test pipes. Resonated pipes help, but it'll still be there.