Drilled/slotted rotors are only good if you race your car, and use your brakes often to slow down at high speeds. The reasoning in having that is when the brakes are at a very high tempeture, a gas will form, so when you apply the brakes, the gas prevents braking, Slotted/drilled rotors allow that gas to escape, and allowing the brakes to function correctly.
Drilled/Slotted rotors are also a pain in the ass for those who have to cut them with the Brake Laite(sp?)
This is just what I heard from my autoshop teacher though, sounds reasonable since brakes had poor cooling when it was all drum brakes were more insulated, and lacked cooling abilities.
Drum brakes suck...
--Looking for Commodore stuff (Drives, Units, Amiga, games, etc)If anyone has any of this laying around and wants it gone, lemme know 
