[wawazat??]

I doubt the ART rotors themselves are thicker than the OEM's. ART doesn't cast them, they buy castings from another source (Brembo, Beck, EuroRotors) and then cryogenically treat them. The ONLY way they could be thicker is by reducing the distance between the front face and the rear face. If they were thicker from front face to back face they wouldn't fit between the new pads in the caliper. Whatever you do, break your new rotors in per the procedure from the supplier. Again, I've never had a problem with warpage, but I believe that the makers of the rotors know far more about the properties and performance of cast iron than I do!

Please don't think I'm knocking aftermarket rotors as I used cross drilled KVR's (cast by euro rotor) on my car and am having an extra set of calipers powder coated black to install this spring. My 17" wheels show the rotors and calipers too much to leave them nasty looking (shamelss plug to the pics in my locker).

Todd