I have a custom exhaust consisting of resonator delete and muffler delete of which I just replaced both with new pipe. Now my question is do any other R's experience a loud POP! or i guess you could call it a backfire during the shift at higher rpms? I noticed it the first test drive after and though it sounded really cool until someone brought up that this might be an issue with the car. The car runs fantastic and has had no problems. Sooooo is this just another cool feature of these cars or what?