Originally Posted by Porschefile
I wouldn't bother for rears, rear brakes last forever. There is at least some evidence that cryo makes rotors last longer, but for rear it is not necessary.
So is this a case where I shouldn't even worry about my rear rotors? I am just suspect of the ZCP rotors and they are about 2mm over min-spec thickness. I'd hate to have them warp and then be in a pinch of needing new ones at the track.