Question about booster..
 

Ok, I just got this brand new bit char-g set called the Auto Modellista Set (based on a game coming for ps2), and it came with boost function...Anywho, I was wondering if I can change the motors with the boost function

Ya you can because the way the boost works is it limits the amount of power to the motor until you hit the boost button and at that moment all the possible power from the batteries is fed to the motor.