I wouldent even be worried about a muffler. Mine is still original at 18 years old. If you looked at the CC threads you would see that in post 6 here
http://www.irv2.com/forums/f112/need...re-245333.html I posted were you can get it for $109.00. I would be more worried about the tires,batteries,pto,transmission,delam,radiator making sure the a/c works and the engine. To worry about a muffler to me is a non issue.