2011 g37x coupe
Invidia Gemini Cat Back Exhaust Titanium Tip Infiniti G37 Coupe 2008-2011 at RallySportDirect.com

 

Not 100% sure, but I believe the Invidia does fit. Why don't you call them to confirm?

 

If I recall correctly when I called them a while back they said something about the front pipes gettin around the differential on the Gemini. I was interested because of the resonators and wanted to know idiot could swap my Q's straight pipes for the Geminis resonated pipes but if you dont do test pipes or HFC's youll be ok non resonated. Perhaps they've made some refinements since then to make it fit or they've made an X adaptable exhaust a this point. They were surprised to hear that the Q300 fit the X Coupe when I called them but it did. If your in NY I got a local pick up on a Q300 for $300. :-P