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In Reply to: Slotted or X-drilled? best rotor for the E-30 M3.. posted by Highrever on May 29, 2002 at 17:10:19:
I went through XP Engineering for their 'frozen rotors' -- don't know if it makes any difference but it sounded cool.
I don't have any experience with holes in my rotors -- but a lot of folks won't buy them unless the holes were cast into the rotor (i.e., many stories of drilled rotors cracking and breaking apart).