I tried looking into a few but found none that im interested. im looking for a really loud single exit that would really make a difference from the sound of the car now i heard the ISR GT single exit that fits the RWD G37 Coupe only needs custom hangers to fit on my AWD model. Let me know if anyone else has any feedback on what they have done to there g37x coupe exhaust wise. Sound clip of what the car sounds like below its just a muffler delete.

 

the ISR single for rwd will fit awd the same. the exhaust is a y back system. you only need to find a y pipe that's awd compatible. the isr y pipe works with awd even if the websites say it doesn't. its been confirmed and the websites haven't updated yet.