Drilled are Ok for the street but not for the track except... Porsche factory rotors that are drilled actually have the holes cast in, same for Ferrari. They hold up much better than drilled rotors as having them cast in tend to stress relieve them. There is supposedly a slight reduction in unsprung weight for race cars with light suspension and wheel components but it would be a negligible benefit for the street. The do look better though. For the sreet, go for slotted rotors unless your just looking for the "Look".