im sorry if this is been a topic covered, but i was just wondering if i were to pick up a 04 coupe stock cat back exhaust for real cheap , is it possibe n how much work would take to get it to fit on my 05 g35x , if its possible or not ?or if there is anythign i could go for aftermarket for dual exhaust on the sedan ive seen a few sedans with dual and i assume it wil cost quite a bit to do so.

 

You need to relocate the fuel evap on the right (passenger side) of your trunk. The coupe exhaust isn't a true dual, it's the same as ours.

Buy the stillen gen 2, it's a true dual.