a slotted and drilled rotor with the same size may cause longer braking distance...since the surface area is reduced...
but then you get lower temp and less dust~
EDIT: hey diablo, i wonder if you need to turn the rotor when you install the pads? (since you have the new rotor...)
well, after looking at the amount of work invovled, I'm having it done by a mechanic.
Also, I hate to screw it up and crash my car