Get the Evo engine or better yet for about the same money get the Thunder Tiger Pro .46. I have run most of the engines in the .46 class and think the TT is the best for the money. I have a OS 46 FX, Magnun XL 46, Super Tiger .45, and the TT46. I like the way that the TT runs and it has the same power as the OS engine. The OS LA series engines do not make the same power as the rest of the ball bearing engines. The LA series engines run well though. I have had the 40 and a couple of 15's. I liked the way that the Evolution engines run. I have had the 40 and a friend has the 46. They start easy and are already broken in. You can install it and go fly. If it were my $ I would buy the Thunder Tiger.

Rick