Leave the stock motor.
The coolest thing about it is that it LOOKS real and it acts real. Make it an over-powered mutant and you just stole some of the cool away. You might as well throw some wide tires and a skinny body and make it a Rustler.
Just find some other guys that have them and have a REAL race.
We're going to do it at our track as soon as they're out around here...