I was just curious about something. I have rear bumper off right now and I was driving the car yesterday and the exhaust was MUCH more quiet. In fact you couldn't even really hear it above the radio. When the bumper is on, the exhaust is much louder and the drone can get loud around 2800 rpm. I have a CWest rear bumper (fiberglass) and I was wondering if anyone had tried to dynomat their rear bumper to see if that made the exhaust sound a bit more quiet?