its the 2650. I still need to get two matching lipo batteries. Going to try it out with my existing 7.4 2s maxamps in there now. Also the bottom of the steering servo mount rubbs on the electronics tray, so I need to modify that somehow. Went together pretty easy, nice fit, AE did a real good job. Thought about getting a 3s and running a single battery but dont know how a 3s would move this motor. Im completey new to this 8th scale brushless stuff. Also im running the supplied 16 tooth pinion, dont know the limits up or down on that.