I would say slotted before drilled. But if you're saying that because of what I said, I can't recommend the PFC-Z pad enough (bimmerworld only). Lot of modulation when cold, but one hard stop and it bites at the top for the rest of your life. The dust is comparable to OEM but its the pad that never gives up. I know I am in a 328 but I am running 330 brakes. Just my two cents on pads if you're in the market. I did a CCA drive and was hustling behind an 11 ZCP M3 and experienced no fade. It can start to squeal a bit after lots of aggressive stopping but it goes away when they cool back down.