The heat shield and my son's Jeep 1998 TJ 2.5 l 5 speed heat shield fell off, now his carpet has a little bit of a burn mark. looking for a heat shield found a Flowmaster aftermarket heat shield I believe it's 22 in Long by 11 inches wide. I know my son's Muffler is 17 in Long and around 11 in wide. does anyone have any experience with the Flowmaster heat shields or should I go with an oem or another route?