i need some info on radio systems. first of all i have a nitro evader st. i would like to up grade my radio system but not really sure what all i have to change (servos, receiver and so on) and also if someone could recomend a system that will work for me. second of all can you just change the crystals in the radio and the receiver? also i just saw a radio on ebay that had no crystals servos or receiver. could i take my crysals out of the stock radio and make it work?