dont waste your money/time/effort on drilled rotors....for all practical purposes they offer no benefit, and in all actuality are a potential detriment, as stress cracks can form at the holes, and you know what happens after that.....
another forum i'm on, one in which the cars are regularly autocrossed and track rats, NEVER use drilled rotors, as there's been far too many times theyve exploded on the track. if theyre not using stock brake parts, theyre using slotted rotors only.
slotted rotors, no problem, but look for the ones in which the slots do not extend all the way to the edge of the rotor. IIRC, nascar no longer uses drilled rotors, they use ones that are "slotted", but rather than one straight slot they're like a bunch of "Cs" machined on the friction surface.
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costs too much
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