i'am so loving the 3 port r this engine packs a li punch from the bottom and pull hard til the top but just could not find my tune in the cold weather to night its was'nt the engine the receiver batt was dumping and my throttle was not responding according but i was so concerned wit the needles did'nt realize i needed to charge my batt. rook mistake i guess that's why i was all over the place tonight but all and all the 3 port is a li beast for the buggy seam to be the right amount of power for the small track i run!