There are allot of variables here that can effect the level of noise that comes out of your G. If the clutch is stock as are all other components that the primary source of the noise would likely be coming from the transmission input bearing. Depending on the actual level and exact type of noise there are many components spinning at engine speed that can cause some sort of noise. The Gs equipped with the 6 speed are notorious for making noise in neutral.
Check out the G35 section of our little group.
http://forums.g35club.org/zeromain
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