I think they drilled it themselves. I'm sure they work, but you may have problems with them if you plan to work them hard. I hear they may crack if you do so. Being dimpled sounds like it's half drilled or it's more like slotted, but dots instead of slots. *shrug* no comment.

The AEM big brake conversion is crap from what I hear. Don't waste your money. It works, but not for its price.

Get the slotted Brembos, or go with another repuatable brakes company. Where can you get slotted Brembos at anyway?