The oil cap can be removed but I can feel the vacum when the engine is running. I dont know how much vacum because I have never compared it to another boxster but its definitely tougher when the engine is on.
97 with 33,000 miles
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1997 Boxster 986
TechArt Championship Formula OZ Wheels,
TechArt Springs
TechArt Strut Brace Front and Rear
Technobrace (Thanks Pedro)
Michelin PS2
G2 Red Caliper Paint
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