Oh yea, I knew that going into it and it's actually much better than I expected. With HFC's and/or test pipes the hiss is pretty much unavoidable. I will say that it is really not bad with HFC's. I can't speak for test pipes, but I would assume it would be noticeably louder.
In any case, the exhaust sounds awesome. I'm completely satisfied with my purchase. My installer really liked the system as well.
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