[Dave S.]

My car has a similar smell sometimes. Seems to get more noticable if I've been slowly idling around the neighborhood. More of a hot smell than anything else. Stronger near the driver's side rear wheel area. I've had my car checked out by the local Porsche dealer and everything is found to be normal, in fact he said my engine is one of the cleanest he's ever seen.

I just assume it's a normal Boxster smell now and don't worry about it.