Wow! I know what you mean 
I have a squeaking, right down annoying sound coming from my passenger side.
I fixed it though, I bought same FI test pipes and exhaust. My wife doesn't like how noisy the Z is now so she doesn't ride in it anymore 
Problem solved
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Fast intensions Non-Resonated Test Pipes and TDX CBE w/18" Resonators, Stillen Generation 3 Long Tube CAI, tint, tail light covers, Gramlights 57Xtremes, CS Nismo kit, and several carbon parts. Slowly getting more
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