I track my MKII regularly. The instructors that I have had have gotten me to a point where I am reasonably quick around the tracks. One down side is the chassis flex which results from running hard causes the doors to pop open regularly in the corners. It has gotten to point where I have wired the doors closed but surely someone has come up with an ingenious way to rectify the problem. Any detailed suggestions would be appreciated by myself and the corner workers who freak out when my doors are open.