Um what you need to do is get crap load of CRC or wd40 and spray it around the gaps as much as you can and with a rubber or plastic sided hammer just tap around it to loosen it up and then try pull it out with plyers
trust the wd40 but seriously be generous with it and give it some time to work...make sure you tap the sides of the muffler about to loosen it up...then use the plyers. Ive had the same problem in the past.
It's stuck because of corrosion. Another product that can help getting it off is "rust off goo". Typically found in workshops. Also requires generous amounts for it to be effective.
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