Hi, I have had a couple of the SIG ryans and they are a beautiful plane. One I had was the "aerfobatic" model detailed down to the stop watch holder bracket on the instrument panel. I used the Inline Top Flite muffler and adapter on a HB 61 and it worked great. Just remember it has a narrow gear track just like a cub, so watch that taxing. Flies great but sits high and may nose over easy on landing. Make sure your LG is stiff and secure.