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Slotted and cross drilled are both techniques to help get brake gas vented. This helps keep the rotor cool and helps to reduce fade. The do overall have more braking power.
Those are the advantages, disadvantages contrary to popular believe the do not last longer! and they also shorten brake pad life. Unless you you are using them with a baer calipers and something like hawk brake pads you really won't gain much from them. Also unless you are driving a heavily modded car used ofr drag or SCAA the ar e a waste of money, u'd be better served buying just plain bigger rotors
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