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I suggest doing a search in the 911 Technical Forum or the Autocross and Track Racing Forum for this topic. It has been covered numerous times before. Key terms like "Bill Verburg" and "drilled brake rotor cracks" should do it.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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