My 1955 International (Farmall) 100 came with a straight exhaust pipe depicted in the photo. I had to remove & replace the manifold and pipe as it was rusted through. The replacement manifold has a 10" straight pipe. The parts manual does not list a straight pipe but instead a muffler and cap. I believe this 100 was a special order Industrial as it came yellow paint, foot pedal, & no lights. Do you suppose the straight pipe was also a special order? I don't recall seeing any other pics with the same configuration.