I had the same problems, with Z1, Centric and one other brand of rotors. All of my problems went away when I switched to the stoptech brake kit. I would get about two track days before the steering wheel would start shaking on braking.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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