It's the Catalytic Converters and the hot engine "Cooking Off".......normal for a P-car IMHO.
I have smelled every odor a car makes, and the Boxster emits a very distinct hot engine aroma. I would bet if a Chevy truck had an engine compartment fan for a
rather enclosed area it that vented like the Boxster, it would emit the same smell.
YMMV
