my racing buddy has a highly modified t-maxx with an italian .21... claimes around 3hp or something like that... So far all the truck does with that combo is around 45mph... I was expecting more... it will pull the fronts but not too good... He just picked up the genesis and completed break in... I am impressed to say the least... Its a beast!!!!! still running rich.... I want one... I don't know what all the complaints were about... this is veery solid... tons of power and not even tuned for it yet.. pulls wheelies on command... shifts into 2nd no problem.. haven't adjusted for third as its a bit unstable at fast speeds in the parking lot... really doesn't even need third gear IMO... steering servo is the only upgrade it really needs..