I like the sound that my G35 coupe has stock, but I'd like it to be louder and more full if that makes sense. I don't want anything to loud and over the top, I just want something that sounds real nice.
My friend told me he'd heard a tanabe exhaust before that he thought sounded good and was kinda what i was looking for, but I'd like some more opinions.

this is the tanabe he was talking about
http://www.tanabe-usa.com/touringmedalion.asp?id=7

 

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for the coupe i love the sound of HKS.
if you just want a tad louder, Injen sounds close to stock.