RE: Is it possible to fix Nelson Muffler
For most folks Bill is correct.
But, if you have access to someone with a TIG welder they can build up the broken area with weld and then machine it back to specification it will work fine. To just take it down to a weld shop would be quite expensive but, if you took all of them at the same time and you did your own post welding machine work it shouldn't be to bad.