ability is from the additional camping force on the pressure plate. I'm not sure how much of a difference there is between the stock disk and the RPS one. I guess cost would also enter into the equation. Also, what do you use the car for, performance wise? I believe Greg Dupree is the main distributor of RPS products , and I know some of the other vendors carry their products as well. You may want to ask one of them about the benefits of one disk over another. Good luck, Mark