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The change to hide-a-way headlamps with the introduction of the C2 produced a cleaner look when driving during the daytime, but notice the car's high parting line. Any air passing below the level of the smoke goes beneath the car, causing both lift and drag. One styling cue that's helpful, however, is the humps over the wheelwells. They keep the air from sliding off the top of the car and down the sides where it can cause more drag.