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What is the purpose of the BMW 4 Series air curtains?

I recently noticed that my BMW 4 Series has air curtains near the front wheels. What is the purpose of these and how do they improve the car's performance?

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The air curtains on the BMW 4 Series are designed to improve aerodynamics and reduce drag. They guide the airflow away from the front wheels, reducing turbulence and creating a smoother airflow around the car.

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