when i took my car in to get the exhaust hung, they tightened the clamp on the end of the muffler so that it made the opening out of round. Now I am finally getting around to completing the exhaust (rather than just open after the mufflers) I cannot get any pipe into the outlet of the muffler because it has been smashed a little. Is there any tool or method that will allow me to make the outlet round again, kind of stretch it back so i can slip a pipe in there?