I have been thinking about trying this for awhile, but wanted to wait till after the race season, and nationals. So I am testing out a set of the new Emax Eco II motors. These are the 2306 1900kv motors designed for 6S, but I am going to be using them on 4S. I know the speed wont be as fast, but I am looking for clearer lines, and moves. As opposed to just pure speed. For me it's about being smooth, and consistent. At nationals if you could be fast, consistent, and stay in the air. You were golden.