Thread: Fast Intentions exhaust is here!
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Old 05-26-2011, 04:25 PM   #5800 (permalink)
Ron
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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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