From a manufactures point of view (and one that reflects the same as Wilwoods) the use of DRILLED rotors should be limited to street applications ONLY, not for track use. Say what?? The use of drilled rotors on the track is one bordering foolishness given the extreme levels of heat that will be generated with the proper pads. This extreme level will be the down fall of the holes....The difference in air temps will allow the iron to crack. While the purpose of the holes is to vent the gases of the pads (as is slotting) the added benefit is simply rotating mass. Yes, yes, we all know about Porsche and others who supply cars with rotors and holes in them. They are manufactured that way and not drilled. Not to mention the very improved dynamics of the car compared to yours....Few cars on the track have drilled rotors today- carbon aside. Most have slotted or plain rotors for all their applications. If they do run drilled ones you can be sure they are replaced often at the first signs of fatigue. If you want the 'look' I now reluctantly offer it, but don't push it. "Rotor Envy"
