My Z does this too and you can really tell with an aftermarket exhaust. I get a little gurgle and a pop or two coming to red lights while downshifting.
I wouldnt worry about it OP unless you are thrown towards the windshield.
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Takeda TR3009P Short Ram Intakes, Custom Dual Exhaust, X-Piped with 18" Resonators & TopSpeed Axle Backs. EVO-R Led Third Foglight,
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