Armonster: Sadly that hissing sound is just a by-product of the VQ and is unavoidable with any open (non-catted) exhaust system. I just installed my ART Pipes last night (will post a full review shortly, once I get more seat time) and switched from test pipes and I can tell you that with my test pipes the hissing was MUCH louder and more pronounced. You should only really hear the hissing when you're revving and the RPM's are dropping, right? Or if you happen to be cruising near a wall you can sometimes hear the hissing sound since it's reflecting back at you off the wall.
I drive a 350Z HR and I will say that I am having some sort of issue with a rattle and vibration. I'm not sure if the two are related. I'm going to get under the car asap and see what's going on.. it definitely isn't normal.
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2007 350Z HR :: 3.7 Final Drive : Injen Long-Tube Intakes : TurboXS Cat-Back : Eibach Sportline : Enkei RPF1 18x9.5/10.5 +15
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