I have the castle 2200MM in my E-maxx and Castle states up to 5000 watts for it, so far ive only broken a ring gear tooth on a two year old diff.

Here is a quote from castles site..............and yes i know its their site where the numbers are proudly displayed: "Mamba Monster systems typically pull 4,000-5,000 watts (5 to 6 horsepower) under acceleration. The Neu-Castle motors are some of the highest efficiency motors that we have ever tested; they are up to 85%+ efficient on our test rig."