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ok...
here's the rundown.
the slots/holes DO keep the rotor cooler...
however, they are designed to flow the built up gas (from the friction of the pad and rotor) away from the braking area....
what that means is that as your brakes heat up from repeated usage, the amount of waste gas b/n the rotor and pad causes "brake fade" as it takes longer for the pad to come in full contact with the rotor.
so, if you have the slots/holes, it allows the gas to escape from under the pad, so there is no brake fade.
i drive my car hard every day, and for the driving i do, even with a set of rotors that are the same size as stock, i do notice alot more consistency in the braking.
the rotors may not change your braking performance (distance, etc) but they will help you be more consistent in your distances...
like if you did 5 60-0 runs with holes, you would notice a fairly consistent distance, whereas with the non drilled, you will notice that the distance becomes longer.
so the first stop may be equal b/n the two, but the last ones wont be...
so...
main reason is consistency
ideally stepping up to a bigger rotor w/more swept area and holes/slots will cut down the distance AND be consistent...
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