It accelerates the velocity of the airflow underneath the car to create downforce. The pressure under the car is affected by the diffuser so that it can expand back to ambient in the diffuser, as the car moves forward, such that the pressure decreases while the velocity increases. Since the pressure below the car is lower than on the side and above the car, downforce is produced if implemented correctly. The diffuser "drives" the underbody, which produces the downforce.
Performance Style Rear Diffuser -Matte Black -Made of durable Polypropylene -Snaps on. What's in the box. 1 x Rear Bumper Diffuser. What you might need for installation.Installation manual is not included. Professional installation is highly recommended. TITLE: Rear Diffuser For BMW 550i 11-16 Sedan With M Sport Bumper F10 Sedan Matte Black 267178 / SKU: 5-DIFF-BMF10MP-MB-550-B3 /. The item "Rear Diffuser For BMW 550i 11-16 Sedan With M Sport Bumper F10 Sedan Matte Black" is in sale since Wednesday, August 21, 2019. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Exterior Parts & Accessories\Bumpers & Components\Bumpers & Reinforcements".
The seller is "advanation" and is located in Rowland Heights, California. This item can be shipped worldwide.