Why install a heavy KB engine on this plane when a TT46 is enough. Performance will suffer quite a bit. The only thing you will be able to do is fly around and and hover but there is more to 3d besides flying around and hovering. Come on a 91 FX on a Magic. Thats just rediculous but to each is own. If you want more power than get the 50 sx
or a YS 45 or build a mousse can muffler for a 46 fx or a TT 46. Or build one for the 50sx or YS 45.Plane will be considerably lighter and fly better