I have the older E-converted nitro version with the 44/14 diffs and these things can really go. I did however had to update the diffs with the heavy duty diff ring gears, as the stock onces did not last too long with the power overdose. I've ran 10s A123 with a 1512 1400kv tekno neu motor. I dragrace with 4s2p A123's and bash around with a 4s hardcase lipo. Motors use with the lower voltage are in the 3000-4000kv range. Torque wise, a 1512 size 4 pole motor or a 2 pole C50-L size Hacker motor are perfect. I've ran a 1515 2700kv Tekno Neu and it was just too much power for the poor diffs. I'm guessing the 43/13 buggy diffs in the GT2E should be the updated/upgraded version to deal with the brushless power.