Originally Posted by
omgwtfbbq!
Modern brake pads do not require gas evacuation for performance, the only thing driller/slotted rotors will do for you is decrease contact area, thereby decreasing the braking force.
I'd like to see where you got that info. Even today's top of the line carbon ceramic rotors have holes.
Regardless of any gas evac requirements, the pad still creates dust which gathers between the pad and the rotor. Slots allow a place for the dust to go so it doesn't continue to build up. That's my understanding anyway.