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Bingo @PCV
Porsche has known for a long long time that pulling a vacuum on the engine was a good thing. Most european car companies do this, it wasn't until the late 90's the "merican" car companies figured it out.
PCV's pull vacuum on the engine, but it was not what we call "plenum or port vacuum" it was a simple line from the PCV to the air cleaner.
New LS GM engines have a version of our AOS on them.
12k RPM VW drag engines will make 3-4hp *more* with a belt driven pump
B
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