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actually the drills are simply to disapate heat, but the slots create heat and more friction causing a better stopping force, the track cars use solid rotors because they have huge 4,6, and sometimes 8 piston calipers that dont need to utilize the slots, but i guarantee my drilled and slotted rotors will last longer due to the fact that they disapate heat and dont warp like solid rotors do, the ss brake lines and brake fluid take the higher heat but you will soon be seeing either warped or cracked rotors due to the slow disapation of heat, for me and my hard street driving around town i would not use anything but drilled and slotted rotors, i resurfaced my solids and they were warped in about a 1000 miles, i have been going 11000 hard miles on the drilled and sloted rotors no problem
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