How do the standard brakes on the 4.2 A6 hold up under the rigors of a driving school? I realize there are lots of variables (temp, type of track, driver braking technique etc.)that would affect the answer but I'm looking for some general info. I've heard the 4.2's rotors have a propensity to warp under "battle" conditions.

Also, does anyone change to a different set of brake pads on the A6 4.2 for driving school/track conditions? If so, what kind?

I'm also posting this question in the performance & A6/S6 forums.