O.k...here might be something helppufl, cuz i have seen some foo did this to otehr people's car...taht is... Some stupid people sometimes will throw coin(s) from teh tip into teh muffler, and then when you start driving, teh coin(s) will rattle, and making noises, teh bad news is..if thats the case, then 90% the time they can get it out, but good news is, if you ar ethe lucky 10% then they might cut undo teh muffler, and shaking it out of the pipe, or teh tip, but thats only 10% of teh chance