I am assuming HPI's MT2. The .15 has enough power to keep your attention for a while but I reccomend the 18. Keep an eye on the clutch, mine likes to be replaced often. (driving style I guess) Mine also likes to toss out its right front drive shaft in tight turns, shim it with a small o'ring. If you don't already have them, put turnbuckles inplace of the plastic tierods. Its a nice little truck for the track, enjoy.