I recall Zimmerman IS an OEM maker... that said, I have not used the rotors in question. Unless you expect heavy track/de use, changing from a stock to a Driller or slotted rotor may not show any benefit at all (from a performance standpoint).
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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