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CANCUN, MEXICO - JUNE 4, 2017: Motor car BMW M3 (F80) in the city street.

Munich, Germany - February 6, 2014: Headlights of a BMW. The photo was taken at Munich Airport.

BMW cars: 640i, 425d and M235i parked outside near the Welt in Munich, Germany. June 21, 2014.

Amsterdam, The Netherlands - April 16, 2015: BMW M3 luxury performance sedan on display during the 2015 Amsterdam motor show. People in the background are looking at the cars.

$Rear diffusers and sensors of new modern sports car black detail view banner.\nA diffuser, in an automotive context, is a shaped section of the car rear which improves the car's aerodynamic properties by enhancing the transition between the high-velocity airflow underneath the car and the much slower freestream airflow of the ambient atmosphere. It works by providing a space for the underbody airflow to decelerate and expand (in volume, as density is assumed to be constant at the speeds that cars travel) so that it does not cause excessive flow separation and drag, by providing a degree of wake infill or more accurately, pressure recovery. The diffuser itself accelerates the flow in front of it, which helps generate downforce. This is achieved by creating a change in velocity of the air flowing under the diffuser by giving it a rake angle which in turn generates a change in pressure and hence increases downforce.$