About a week ago when I was taking out my tranny I had to drop the exhaust of course. Well the rear muffler caught the rear bumper and broke off a piece of it on the lower area of the bumper. What should I do? Should I repair the bumper or locate another rear one. If repairing is the answer, What is the best way to go about doing this i.e. type of fiberglass, filler, etc.