Originally Posted by bpchaos

The stock rotors are fine. I ran something like 7 trackdays on them without issue before swapping to the Z1 2pc.

Did you run any other pad on the car before putting on the carbotechs? I went from Stoptechs > Carbotechs after a day at Autoclub and the judder was bad. I don't think the Carbotechs like any other pad compound on the rotor - bed them again or have the rotors turned at a shop. It got rid of the judder for me.