Agree! Z1 2 piece rotors are totally garbage for track days. I warped 3 sets. Two of them warped in 2 days and 1 warped just in 3 sessions.
They are OK for street driving. But stay away from Z1 2 piece rotors if you are serious about tracking.
I upgraded to AP9668 with 372mm rotors using the bracket DarkJak provided. It solve the problem completely. It handled 30+ hard track days even without ducts.
Last edited by gsg740; 11-08-2022 at 03:35 PM.
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