Does this muffler look like this?
If so, the muffler isnt made any more The muffler is probably OK though, you probably just melted the exhaust hose. The hose can be a pain to get off, the heat causes it to bond to the risers and mufflers. The best way to break it loose is get a get a big damn pair of slip-joint pliers and try and twist the hose on the fittings to break it loose. Be careful not to squeeze to hard and crack the muffler though.