I'm going to experiment with a few larger outrunner motors from Hobby City on my Redcat Rampage. I'll post results as soon as I get things all hooked up. I'm also using the Sentillion ESC and figure that with up to 12s to play with, I have room to ramp up the voltage on a direct drive (instead of center diff) setup with two packs on either side of the mounted motor. We'll see..