I had DMC in Irvine turn and cross drill my rotors when I had in the ar in for a shimmy in the brakes. The cost to resurface the rotors and cross drill them was more than the cost of a new set of rotors! The simmy is for the most part gone but the car is noisy when you apply the brakes. I think that if I had it to do over again I would have simply bought a new set of rotors and not bothered with the cross drilling procedure. I cannot atest to the stopping difference, if any. The cost and noise in concert with the fact that this is about the only change that I have made to a perfectly stock car with 10,000 miles makes me think that I made a bad decision. Scot 6452