I use that to slip the clutch. It's called a "clutch tamer" and I modified it to work in the GTS so with good results. It essentially allows me to temporarily adjust the clutch pedal so return at a slower, controlled rate to help keep the car in the powerband, now knock the tires off at the hit/shift. It works well, most of my traction problems will be worked out in the progressive controller. It can get a little wild when the nitrous activates but the car goes nice and straight even black tracking.