Being a tool freak, I look for every excuse to buy more tools. Heck, I just bought an $800 pressure washer to clean mildew off my soffits. Still, I can't bring myself to invest in a good MIG or TIG welder just to do RC mufflers.

Aneat, my vote goes to a "wrap-around" style muffler for the Poulan 46cc or any of the Kioritz (Echo) engines. I also like the idea of a separate header and firewall mounted canister muffler. The "in-fuse" canister setup is great if you got the room for it, but not every fuselage lend itself well to that kind of modification.