Well it clearly has something to do with the exhaust, or something caused by the vibration of the exhaust, as there are no moving parts back there when the car is sitting still. I would get it on a lift and see if you can pin point where the sound is coming from.
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2010 370Z Touring MT | Stillen | Motordyne | Momentum| Z1 | Fast Intentions | Advant Garde | RE11 | Swift | SPC | Quaife | Whiteline | Evo R | 322RWHP 259ft-lb Mustang
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