Well, the stock exhausts of the G37 and 370zs are identical. But maybe the G37 exhaust was designed to be slightly louder to offset the additional sound deadening whereas the Z's exhaust was designed to be slightly quieter due to the Z's lack of sound deadening.
You can't compare aftermarket exhausts though, it is apples and oranges due to the variations between different aftermarket exhausts.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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