an 8xl will give you really good speed but you might also want to look into getting a lehner although they do cost more. You could also go with a 12020 controller and it would hold the motor better but its up to you.

I want insane power! :) I have all UE parts if they can't take it nothing will.

I don't want to burn up the esc and motor though. Don't a 11xl have less torque than a 8xl on 20 cells?

if you want insane power the possibilities are endless and the amount of money you wish to spend is the only limitation

actually the more voltage the lower the gearing so the less torque although there are many factors. the 11xl on 20 cells would be INSANE!

8xl + 9920 + 20cells = INSANE POWER

Well why stop at 20 cells. If you want insane power 10s lipo 2280 10t motor 36150 esc center diff or slipper and hope it don't get away from you. It is insane. then again it you pack about 24 or so cells on a 12 xl you get longer run time and speed.