Not Ranked
Slotted rotors are supposed to be the most efficient under heavy braking and heat generating conditions. I don't have holes or slots in mine, but I have seen some NASCAR rotors they use on the short tracks where they get red hot and they had slots. Unless you are doing a lot of really heavy braking, I think their main purpose is to look cool. Also from the NASCAR garage shows, they never use the same ones twice as the heat tends to warp them and cause problems. They are also used with the high temp. brake pads that won't work on the street. Some of the guys here put them on their cars and they just drive the cars on the street and put them in shows. They like to point out their Racing Rotors at the shows.
Ron
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