My friend has the 3.5 Camry 268 HP with just a D5 Concepts exhaust axle back (like 100$). It sounds absolutely perfect, it blew my mind. D5 concepts does make an axle back exhaust for the G35 and I'm very very interested if anyone has any experience with this exhaust on a completely stock G35 coupe. There is one video on you tube of it and it sounds amazing for the price. Wanted to know what the shop would have to do to put on, because it probably doesn't fit perfect.

http://www.d5concepts.com/1-mu-nsg35-2-a10.html

Youtube video
http://www.youtube.com/watch?v=a0oTvRgxz6Q