It all depends on how hard you plan to run. We have run the PUSA and Raymond's Performance Camaros with the duo cast CTS-V rotors. There was no clicking and while we were cautioned about possible warping have not experienced that either.
I am not a fan of the Carbotech XP12 and XP 8 combination. I prefer the XP 10 in the rear. Working with the CTS-V setup and Bruce Raymond we have customs pads that will be available through Bruce and Raymond's Performance. I'll poke Bruce to chime in.
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