Riley,
That sounds awesome...I've been lookin at bigger motors also..naturefreak has the O.S. .18 Cv-rx I believe....its a perfect replacement I understand...and its at killer motor...insaine more power and torque.

Ronnydobbs,
Forgot to mention that with bigger tire come harder steering at slow speeds, but yo can fix this with a servo upgrade...I have the Futaba S3001's on mine, you can get the S3003's as a replacement to, which are a tad bit nicer, they are ball bearing but have the same torque.[8D]