I've nearly got the exhaust welded back up on the 1 ton, time to start looking for a less restrictive muffler.
The flange that connects the front half to the back half had a piece of it's gasket missing. Being a high temp gasket in a place where I won't need it to come apart again, I simply welded up the missing bit. If the gasket tries to get out on the edges of the weld I'll just keep going around and weld it up solid, as is, it seems like it will do fine.