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I think what you are experiencing is quite normal.
Even with a new AOS, when I removed the oil filler, I could hear a vacuum being pulled and it lowered the idle rpm a little.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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