Your right Daven, unless you can do like I did & find both engine & muffler slightly used right here on rcu, I got both items for $150.00. Bfife, if you are looking for a new one you can go to
www.pspec.com & find what you are looking for, but you might list it wanted in the engine parts section of this forum & find what you are looking for, there are quite a few mufflers that will fit many different engines. the 0s46fx, irvine 53, os50sx are all the same. When I found some on here I e-mailed performance specialty & asked if the particular muffler would fit the engine I had & they sent a reply very quickly & wala im in the air.
Good luck
Gil