There are many ways to slow a car down at the track, short shift it by 500 to 800 RPM, over rev it several hundred RPM above the best shift point, let off the off the throttle on the other end or on the starting line 30 to 50 ft. from the starting line. Put weight in it, put more air in the rear tires, deep stage the same every run, lots of options to slow the car down