[Christ]

That's awesome... I used to help build HP engines for lawnmower/gokart racing (5-15HP, high revvers) and the mufflers were usually made of tin cans, one inside another, and the inside one was punched (not louvered... we weren't that high tech) and then packed old dish scrubbers in them (steel wool) and bolted a pipe adapter to them.

This allowed us to reuse a pair of steel cans, about 7-10 steel wool scrubbers, and old hardware that we got from updating piping in buildings and houses.