The Z & G37 do sound the same or very close IMO. I think a lot has to do with how your hearing it. I drove a G37 and the interior has a lot more insulation. I think it drowns out some of the high notes. From outside the car, they sound very close, stock vs stock.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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