RE: Bullit?
Look at the size of the bullit, an OS91VRDF would be like the old adage says "with enough power even a crowbar can fly". But I doubt it would fly very well. If you want to try to take that airframe as fast as possible, with the size, I think you'd be faster with a JETT50 or Nelson QM40 or something. It's a pretty small plane, an OS91 with pipe would be nearly doubling the weight of the plane I think. Just my opinion though.