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When the headlamps are raised, the C2 becomes a much different car. The vertical wall created by the headlights not only causes drag, but notice how the airstream separates from the car and doesn't reattach until midway up the hood. The area between the smoke and the car is a low-pressure zone that causes lift at the front wheels. This photo (along with all the smoke tests) was taken with the wind blowing 35 mph; it only gets worse as the car moves faster.