As long as running in 2S, the GT2.1 works as good as GT2 PRO or other ESC in the market....with the new SC software that we are going to release soon, it has been killing on the track. We have drivers used it on SCTE 4x4 and it is the best ESC so far, smooth power and the brake is unbelievable. According from them.......

And yes...its been tested with NOVAK HV5.5. the new 550 and Tekin 550....all works. Just pick your choice of motor.

And Speed Passion will release our own 550 motor soon....our driver is testing it now. Both 4X4 and 1/8th....it is the best so far.