Yeah my buddy had his g37 with a muffler delete and a lot of people said it sounded terrible. I might just go with the InvidiaI always thought the Invidia was deeper tone than the OEM exhaust. But maybe it's different on the 1st gen. Honestly, having heard G37's and 370's with muffler deletes, I think it sounds horrible. There's rasp and it sounds like a Honda at higher RPMs so the tone isn't deeper. That's just my opinion though.