How about some discussion of the Webra .50 vs the MVVS .49 in terms of torque, throttle response, and throttle setting stability? If 3D is all about hovering, these characteristics seem pretty important. Which of these motors provides more reliability in these categories? Ideal prop size for a 4 to 4.5 pound 3D? Should you go stock or aftermarket for the mufflers? Thanks.