Fred,
I don't know on the g-26 ?'s. I have an O.S. 1.60 and bisson pitts muffler. It flies awesome, no extra weight at all. All you can see is the ends of the mufflers. The head and everything else is all inside. I had a warped elevator half. Sent them the elevator and they sent me two FULL sets of tail feathers for it, Vert. and Hor. Stabs and control surfaces. I asked about the tires and they pointed me to the dubros. I found them at the lhs. They look and work great.
Stangevil29