I do like the sound of the Nissan 3.5 V-6 in the G35/350Z, but I am surprised that nobody mentioned the Volkswagen R32. If anyone out there can make our V-6, which, ironically, is the same size as the Volkswagen's, sound like the R32, I would be the first on the list to buy the system! My vote for the best sounding exhaust system, stock, is the R32.