With drilled rotors you are also losing braking surface area and most race cars increase the size of the rotor to compensate for the loss of surface area. You are not going to gain anything by installing stock size cross drilled rotors on your street car and for the track(road track/autoX) I would guarantee they will warp and/or crack. For drag maybe since you are reducing weight but that is very minimal and you will lose stopping distance. If you want to increase your braking capabilities then save your money and buy a brake conversion that includes larger diameter/width rotors and calipers with larger or multiple pistons to increase brake force. The S.S. brake lines do work better since they do not expand and allow a more force to be applied to the brakes and I would do this before going to the drilled rotors. The cross drilled/slotted rotors will also wear your pads much more quickly and increase the brake dust problem everyone complains about. I have to admit that our cruisers could use better brakes!
Just my 2c worth.
