The 370Z and G37 exhausts don't sound much alike at all. The G37 Coupes are definitely louder. Nissan had to intentionally quiet down the 370Z exhaust, because our cars don't have trunks or anywhere near the amount of sound deadening to keep drone or unwanted noise out of the cabin. Despite the exhaust note of the G37, you can't really hear it very well inside the car because it's all getting trapped inside the trunk, as opposed to resonating into the cabin like it would on a 370Z.
It's just a consumer-influenced design choice.
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