muffler with hole in it
When we've had holes in exhaust pipes, at times some of them were
able to be welded rather than replaced. However, I don't know if
a muffler hole could be welded. We went to a welding company once,
and another time we had Speedy Muffler weld something. When we
have a problem I ususally ask them if they do welding and whether it is
something that can be welded. It usually has cost us a lot less than
replacement. Good luck.
Also, at auto supply stores you can buy packages to temporarily
plug a hole in an exhaust pipe. We have used these. I don't know
whether or not such a package can be used on an actual muffler.
When purchasing a new muffler, we buy a lifegime warranty and
this saves the price of replacing it if it needs to be replaced again.
Best wishes, Oceanwaves