hahaha! those bolts are NEVER, EVER coming out

. This guy bathed the bolts in RED threadlock...crazy mo'fo'


Ford20, check the hangers themselves (the ones welded to the mufflers not the rubber mount that goes into the chassis) Maybe the weld on the muffler broke and it is shaking and hitting the muffler
Get under the car and check that they are still welded to the muffler