On the DSM it tends to get too sound, shockingly, inside the car. Mainly the exhaust makes it hard to have a conversation. And I feel that my open trunk to the car kind of makes an echo of sound and vibration. So bought some sound/vibration insulating panels, covers 18 sq ft. I hope it will make some kind of difference thats noticeable. Other wise just a waste of money, but at least its shiney? Now to reroute some wiring, put the windshield wash tank in, and panels back on.