| A wing creates lift or downforce. lip = wing In this case the wing (lip) is pointed downward (slightly) when the car is on level ground. Similarly, a wing on the rear of the car angled towards the ground creates downforce on the rear of the car A larger wing has more surface area for air to travel on and create pressure changes. When the DA front splitter (as it is technically called) is fully extended 2" it presents a large surface area for air to travel which creates downforce on the front of the car. Wings create lift and downforce by natural law. Almost anything can be considered a wing under the right conditions. A piece of wood, a flat rock, a piece of paper, a piece of aluminum. Even an entire car or airplane can be designed as a wing. As the car is pushing itself through the atmosphere's (generally) undisturbed air, the wing seperates the air according to the angle in which it is split. A downward facing wing pushes most of the air up over the wing, creating downforce. An upward facing wing splits most of the air to the bottom, creating uplift. The space that the car is moving into is occupied by molecules of air (oxygen and carbon dioxide gas). When it is replaced by the car molecules of Aluminum and other metals, the air has to go somewhere. The splitter pushes it towards the top of the car rather than underneath the car or however it would flow naturally. So it should really not be surprising at all that the splitter acts as a mini wing on the front of the car, creating downforce by natural law. Even this explanation was entirely too much. Some things are just common knowledge and shouldn't need to be backed up by paperwork or research to be taken at face value. NO, additional downforce was not an advertised use of the lip. YES, it is going to aerodynamically affect the car. YES, it creates downforce, I would say minimal to moderate depending on the setting. All front fascias, body kits, wings, lips, etc affect the aerodynamics of the vehicle which they are applied. I depart with this: 
from here: La-Z-Link
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