I think the 46 is a better bet, those 4-strokes will make that plane a bear to fly. Because of the strange shape of the plane, I heard that it easily rolls with throttle. My friend flies his with the 46ax with the standard muffler and says it's a great flyer. Word of caution, though, be conservative with the CG... a little forward of the recommended would be a good starting place. He put his right around the recommended and it was all over the place!!! I say it's the perfect plane for the 46. And it's a beaut!!!