I finally found a Novak HV 4.5 and it is perfect in my Jammin SCRT10 on 2s. So yes there is definitely a market/need for 550 sized motor with high KV's (5000 or so). With the release of the 1/10 Ofna, Jammin and Traxxas 4x4 SC trucks I believe there will be a high demand for a high powered, cool running 550 sized motors for these trucks