Not to long ago my brother hit a tree not to hard, but there is a kink in the exhaust.(no holes). So we refiber glassesed and everything, We put the muffler on with the kink because my dad's friend at work said it would be fine, but i didnt think so. And now were one day from leaving from going up north and with teh muffler on and the kink where the bend is, it is really loud. It has a super low idle like around 500rpm and after a little bit it dies down. Do you think there is to much bach pressure which is making this?