The thing with this motor is that I can run it on 2s to just bash. If I want to do some speed runs or need some more while racing, I can run it on 4s. I am planning on getting the 1110 2.5D, which is 3700kv. Performance should be a little more then the ammo 3900 on 2s. Then I put it on 4s and BAM! hehe