Hi,

I just gutted, then cut short and capped my original mufflers for my twin. I've made numerous mufflers like this for my various conversion engines. They weigh the same, or often slightly less than an aluminum muffler because the wall thickness is much more with the aluminum.

In lieu of that, try www.wackerengines.com or www.lambertsrc.com. I'm sure either one could make you up a pair, especially if you send them a pattern of the exhaust exit.

AV8TOR