I have a couple of 41cc engines running a Kiortz and a Zenoah. Making a muffler is going to be a pain. I want it to fit inside a cowl. Why not just make an aluminum adapter out of solid stock using a mill and lathe to use this muffler?

http://www.acehardware.com/product/i...LAID=109374314

It is cheap as dirt and very light.

I could make up a glass pack type but I don't have flange making tools for aluminum tubing. I don't have the tubing. Bla bla bla, it just gets to be a logistical and cheapskate thing. This seems to be a very quick and dirty way to get rid of the bulky original muffler.