It is possible to buy these types of rotors. Opinions on them vary, but it is unlikely that the average owner (or weekend racer) is likely to see much improvement.
The idea behind all of these altered rotors is to keep gas from becoming trapped between the pad and the rotor. The vents, slots or drills are intended to give the gas an escape route. Also, they are thought to improve rotor cooling. Both of these factors are intended to combat brake fade, where the brakes stop performing well when hot.
Unfortunately, they can all weaken the rotor and make it more susceptible to warping and cracking. Complaints of cracking are especially common on from owners of cross-drilled rotors. And most people have problems with overall brake performance rather than brake fade.
In most cases owners would be better off upgrading to Big Brakes or performance brake pads. These will certainly provide better overall braking performance.
Those who legitimately have problems with brake fade can also switch to higher-temperature Ford Heavy Duty brake fluid.
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