I just ordered one of the 44amp power supplies from a guy here on RC Tech.
57 AMP Power Supplies - 12 volts
You know the guy that beat you at the last race? It was not because of his car, or motor, or battery, it is because he was a better driver. Now go practice so you can beat him.
Visit my Youtube channel for HD R/C videos. http://www.youtube.com/user/DHCross1