Quote:
Originally Posted by F.I. Inc.
The hiss is almost the same with the headers as the test pipes. The one trade off is the headers promote less drone inside the cabin because they promote a higher exhaust note. The exhaust will not be as deep and bassy. Some may like it and some may not!
As far as what causes the hiss, I do not have a definitive answer so i do not want to speculate. Obviously the sound is promoted by aftermarket exhaust components because the tubing wall is thinner and the sound escapes easier.
Tony
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Tony I was doing some reading up on the hissing noise. some of the guys on my350z.com used the magnaflow resonated x pipe the same one you use on your 350z catback exhaust and the hissing went away. And with some further searching on google other people that have x pipes and no cats on there cars for example mustangs they were getting hissing too when x pipes were used.. Im pretty sure thats what it is.