The muffler was cracking coming apart on my JD 455 diesel. It had already been patched, looks like a few times before I bought the tractor. I decided it needed a stack.
I cut the flange off the muffler, filled the hole out 1,67 inches so I could weld in a stub pipe. Then After a purchase at Canadian tire of some elbows etc I started cutting and manufacturing a stack. I wan't it to come out the side panel in the original location. I had to make a couple of U's. Store bought elbows have to wide of a curve the up to much room. So I cut the elbows down and in the lower one I cut gooses bent the pipe further and welded the grooves back up. Its not really welding its more like chicken poop scatter. I think it will hold. I also drilled a hole in the stub for a small tube that I welded in. I will run the breather tube to it. The engine has fair amount of blow by. Blow by oozes out from under the hood and it makes a mess. So I figured I would send it up the exhaust It might burn some of it when the tractor is working hard.
I'll see how loud it is with straight pipe. Can always put a muffler on later.