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I have a 2000 Boxster that is raced in the Lucky Dog endurance series, 6 and 8 hour races. The car is raced hard often on the Rev limiter. I plugged the intake and plumed the AOS to a catch can vented to atmosphere. This car has over 60 hours of race time in it. No issues, no oil consumption, no plug problems. The AOS is for emission purposes. The engines run fine with out the vacuum.
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