Quote:
Originally Posted by FuTuRe is Z
Those who are experiencing a hiss with HFCs are experiencing it as a result of their exhaust and HFC pipes not mating. Some members are running a HFC with a 2.25 in outlet and then are running a 2.5" exhaust. Or some are running a 2.5" HFC and then a 2.25" inch exhaust. The variations in piping diameter at the flanges are causing air to seep out and creating a hissing sound.
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That's a possibility. BUT, some have complete systems with matching diameters. And they still have it. The stock exhaust has it to some degree. If you look back to 2010 or there abouts. It was brought up then.