ehh, my 350z does it in the morning lately, but my exhaust is aftermarket, no cats. the gaskets/bolts up by the headers back out sometime..which is why people shy away from aftermarket headers on the 350. I'm in tune with my Z, I can notice when the hiss on decel from the testpipes is too significant, the gaskets get worn or the bolt is a tad loose in my case. I would have them look up by the cats, assuming the 370z cats are formed the same way..if you just HAVE to have the reassurance.
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