The hiss is pretty unavoidable...........unless you take great steps to mitigate it. A free-er flowing exhaust nets the hiss. I bothered me for a while, but I concentrate on the awesome gurgle that my exhaust makes on deceleration instead of the hiss, lol.
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 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
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