It could very well be the air-oil separator (AOS). A fancy name for what historically has been called a PCV (positive crankcase vent or valve) on lesser vehicles.
It's a known problem on Boxsters, but once replaced with the updated part it ceases to be a problem.
When they fail many folks think the very impressive plume of smoke means the engine blew... not the case.
I hope this is your car's problem as it is a non-event in the grand scheme of Boxster ownership.
Good luck.
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-- John
'00 Boxster S
'86 911 Carrera Coupe (Sold)
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