>Don't forget, you will also need to shave the rain gutters.
Where these shaved on the CTR or ...
RUF offers a product called Aerodynamic Aid? A RUF design for the windshield pillars in polyurethane RIM material. I've attached a picture for reference.
The oil filler was simply for easy access. If you do this mod never let someone else take your car for a ride... mistake it for the gas filler and things get ugly.