im so sorry, but since im an uber noob, i have no idea what are you talking...
i assume GV stands for Great Vigor but what is a 25T ESC? and what is a Core Motor?
btw i've made some PVC tires but havent tried on drifting yet coz' im not sure the V6 motor could handle it.
i've also got my hands on a couple of Yokomo R-03 drift tires but havent tried them too.