I am not going to be tracking the car so absolute best performance isn't a concern, if it was I would buy a proper bbk. I'm just doing it because I hate the stock pedal feel and appearance. I went with the 18z because the rotor on the Cayenne Turbo is 350mm same diameter as the 370z rotor whereas the Cayenne v6 (17z) was designed to use a smaller 330mm rotor.
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