Do not put a 10.5t motor into a drift car, you want 17.5 at the absolute fastest, drifting is all about slow and controlled with a lower high end peak in your motor, you will not be able to control drifts with a very fast motor like 10.5 as you will be struggling to fine adjust the speed all the time. When I started out I put a 13.5 motor in and that was even to fast so your 10.5 will be impossible.