bigchap,

A little additional info, I was thumbing through a 1978 Aero Modeler magazine and saw an advertisement with the muffler version you describe. From what I understand, the Cipolla glow has a decent reputation but the diesel version tends to throw conrods. I do not have the diesel version so I am only repeating from what I've read on the web.
After I broke mine in, I found the lower conrod fit to be a bit loose, but this may be normal. I don't have a lot of time on it.

George