I have the hiss as well. Greddy 20G TT Kit w/ F.I. TT-TDX. It doesn't bother me much, but I keep thinking that I have an exhaust leak (then I laugh it off). I will be experimenting with a "custom" with F.I. first. If that doesn't work, I am going to try something off the wall w/ AAM. I really love the F.I. exhaust though. There is nothing out there that delivers the same performance AND sound.
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 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
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