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Because the air under the hood is at a lower atmospheric pressure than the air above it, a force is created much like the airplane wing in reverse that we refer to as "downforce." By making changes to the shape of the nose, front fenders, and wheelwells, we can greatly increase the amount of low pressure and the overall downforce effect.
Aerodynamics - Stock Car Aero Defined

 Because the air under the hood is at a lower atmospheric pressure than the air above it, a force is created much like the airplane wing in reverse that we refer to as "downforce." By making changes to the shape of the nose, front fenders, and wheelwells, we can greatly increase the amount of low pressure and the overall downforce effect.  View Related Article

 

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