Furthermore, drilling your stock rotors will only perpetuate metal fatigue. You will develop stress cracks where you drilled. Real ??cross drilled? rotors are not drilled at all. They are mostly cast with the holes in them to avoid dangerous problems. Most race teams that have cross drilled rotors throw them away after one race plus they have them cryogenically treated to avoid warping at those glowing red temps. In short modifying your stock rotor in any way is a bad idea. You won??t be able in a stock diameter rotor to remove enough un-sprung weight to do any good.
