Cross drilled rotors don't provide any improvement for street driving. If anything, they can make it worse. With a cross drilled rotor you now have less rotor to contact the pad and more edges to eat up the pads when they are cold. The idea was to allow pad material and heat escape, plus the added weight loss for a race car, where ounces count. Heat is lost in brakes through contact. The thicker / larger the rotor, the cooler the brakes. But are your brakes overheating? Do you just need to put better quality brake fluid and pads with more torque? Try Motul or AP Racing brake fluid. Change it comletely at least once a year. Stainless lines, but that's about it. Rotors brake because the pads leave a residue on the rotor that the pad can work against. Have your rotors cryogenicaly frozen to improve the warpage factor, but make sure you brake them in properly. Every new set of rotors must be broken in properly to ensure their performance no matter who makes them. If you don't you will be resurfacing/replacing rotors every other weekend.
