Quote:
Originally Posted by Ron
So I guess we can agree that hiss is caused by the extended X-Pipe design on non-Nismo Zs but incremented by the addition of HFCs since they are less restrictive. Less restricion = less muffled sound = more hiss. Same goes for TPs. Yes? No?
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I would agree to this. The sound is inherent from an X design, and with the increased flow from HFCs or TPs or LTHs' the hiss is more pronounced... Here check this out:
See how both pipes come together and even if you get an aftermarket Y pipe, you're still maintaining the X profile.
Here is the Nismo exhaust, notice the H crossing instead of a Y/X. Very different in terms of how it affects/improves the flow. This is why it's less noticable on a Nismo.
**Pics courtesy of my350z.com