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Pulled from a post by crossbow:

Cross-drilling a rotor reduces both its strength and its ability to disappate and absorb heat. This results in a loss of overall efficency over a stock rotor, and "increases" braking distance.

Cross-drilling is for aesthetic purposes only and has no performance benefit over a vented or slotted rotor. The manufacturer information is nothing more then a snake salesman trying to sell a product. It has no scientific grounding or merit and can be considered completely false for all needs and purposes.

http://www.mazda6tech.com/articles/suspens...out-brakes.html

http://www.stoptech.com/whitepapers/brakeb...performance.htm

http://corner-carvers.com/forums/showthrea...?threadid=14827

http://corner-carvers.com/forums/showthrea...+drilled+rotors

http://www.teamscr.com/grmbrakes.htm

http://www.teamscr.com/rotors.htm

http://www.powerslot.com

If your bored and want to read 30 pages of argument on this topic...
http://www.nissanclub.com/forums/showthrea...27&page=1&pp=15

Additionally be very wary of cross-drilled rotors on ebay. Many of these are just drilled STOCK rotors...this is extremely bad in terms of strength, longevity, and safety.
 
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