I have one in my Tower Hobbies Kaos 40 and it is an excellent match for that application. Probably the best Glow engine I have currently.
One of the first things I did was to replace the muffler with an after market one (I have an Ultrathrust on mine)
I use it for speed rather than 3d. Mine is running an APC 9x10 at approx 16500 rpm and has been clocked at 146mph

Hopefully it'll be as good on my new plane. At the end of the last flying season my Kaos tried to plant it in 10 inches of farmland. Guess it wanted to see if it would multiply!


George