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I built a weld fixture out of 2x4s and plywood to maintain the orientation of the muffler flanges at the ends. Then I cut it in half around the circumference of the pipe section with a metal-cutting circular saw blade. (The center pipe section is 1/16" thick tubing.) Next, I sliced around the ends of the muffler pipe leaving the weld bead intact on the cast ends. DO NOT CUT INTO THE WELD BEAD ON THE CAST ENDS. This bead increases the diameter to accept a 4" truck exhaust pipe that a welding shop can weld onto the original cast flanges using the wooden weld fixture previously mentioned. The diffuser tube inside my muffler (I call it the piccolo tube) was half gone so I cut it off and left it out when I had the new truck exhaust pipe welded back onto the flanges. I reverse-engineered a plywood pattern for the tail pipe routing and built another fixture so a muffler shop could bend a piece of 2" exhaust pipe to my specifications. The original exhaust pipe is 1 7/8" so I had the cast exhaust pipe flange from the old tailpipe turned by a machine shop to accept the larger dia pipe. Then took it back to the welding shop where they welded the flange onto the tail pipe after I fit it on the tractor for correct orientation. This was long, but I hope it will help others restore their orchard-style exhausts as they are somewhat rare. Post back if you have more questions. The whole thing cost me about $70.
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