RE: Replacement muffler options
[link]http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXGBL0&P=V[/link]
I use this muffler with my Tower .75 on a similiar sized plane with great results. It fits perfectly. I have no tuning issues that some say can occur with a pitts muffler. Try it, you'll enjoy it!
Sorry, just noticed you said you didn't want a pitts muffler....nevermind.