Walter, I am currently running a mixed setup on my D right now. The front rotors are cross-drilled and the rears are not. IMHO, the braking feels tighter than the stock setup and the car seems to stop more quickly. I don't have any official numbers or anything to back up my observations, sorry. Since the majority of the stopping power comes from the front brakes anyway, I'm not sure if much more improvement can be gained by adding cross-drilled rotors to the rear wheels. Just my $.02. Thanks, Aaron King Kirkland, WA vin#1217 _______________________________________________________ Get an Anonymous, Free Email at http://www.sub-mail.com Visit http://www.sub-net.com for the worlds best pages!