An update on my TEU-101s running 11,1Volt: I have two of them running 3cell Lipos now with 7805 voltage regulators mounted. The second one was also put in a 2WD (ball-bearinged) Desert Gator but this one with a Sport Tuned motor.

It goes even more like stink, backflips over the jumps if youre not easy on the throttle and powerslides on dry tarmac with slicks.

No sign of the TEU-101 giving up, but the motor gets a bit hot though. 

I'm not sure how much more power brushless would give me, but this I get for a $20 Lipo pack and a $1 regulator :-)