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I made this muffler from an empty propane tank and pipes from a rotted out old muffler. The old muffler's exterior can was rusted through so I used some of the pipes from it. Drilled the holes into the propane tank, Lined the walls with some fireproof fiber mat and held that in place with some wire fence that has 1/2" square holes. It was a pain to get it right by working through the little hole but not too bad. Welded in the used pipes and came out with a pretty quiet little muffler. It's not pretty but it's more quiet than the Nelson mufflers are and 1000% better than those pepper pot mufflers. This was kind of an experiment so maybe the next one I will use new materials and was thinking of doing 2 chambers.