just what ive seen from my experiences. my friends stang had cross drilled rotors and they got stress cracks. and one of my friends had them on his camaro, same thing happened. i just think its better off being safe and going with slotted rotors, they will be just as good with expelling the surface gases, and dirt, and have about as good cooling as the cross drilled ones, unless the "drilled" ones actually are forged with the holes in them.