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Perhaps the ultimate solution is dry sump system. Those positive displacement scavenge pumps can pull a lot of vacuum for crankase ventilation, and a properly configured oil tank is a great air-oil separator.
Speaking of which, a guy that I autocross with who has a 2007 Carrera S told me today that the Carrera S model in particular has a dry sump system. I thought all M96 / M97 / 9A1 engines all had the same pseudo-wet sump.
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Kippis
986S
991S
Van Diemen RF97
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