Here are a few pictures of my home made super bronc vt8-12 muffler. I made it out of 3 inch exhaust tubing and 3/4 inch tubing for the inlet and exit pipes. I cut out and welded 2 discs into the inside of the exhaust tubing with holes drilled randomly throughout to equal the volume of the 3/4 inlet pipe.. I then shaped 2 ends and welded in place.. The exhaust is quieter than the engine except at wide open throttle. It is slightly smaller in diameter than the Nelson muffler but it is the same length.
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