I take 1st or 2nd every weekend club racing with a clapped out B44.1..We run 17.5 4x4 class indoors and to everyone's surprise always has a class or 3-6 racers. I've made it a point to do minimal maintenance/work to this rig until i replace it with a B44.2 someday and really haven't been disappointed. I have 17.5 motors to thank for minimal breakage and wear though