Brembo doesnt SLOT or DRILL any of their rotors. However, their BIG-BRAKE ROTORS (which are sold and only work with their big brake caliper upgrades) are *cast* with the holes in them.
The stuff you guys see on e-bay is just aftermarket handy-work. People with a drill press just drilling and slotting you a rotor..
The slotted ones are fine. The drilled ones have less mass and are prone to cracking. Hey, atleast they look pretty.
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