Efficiency is the key. The 911s smoothly contoured body panels barely cover the wheels, passengers and hardware underneath. Every air intake, opening and seam has a purpose; nothing is there for the sake of style alone. Slower cars may sport rear wings to make them appear racy, but the 911s wings (fixed on the Turbo, electrically extended at speed on other versions) are there to enhance stability at the elevated speeds attainable on a German Autobahn. They also house an oil cooler.