Downforce is the aerodynamic force that pushes a race car down onto the track, rather than lifting it up (like an airplane wing, but in reverse). It's generated by the car's aerodynamic components – wings, diffusers, floor design – as air flows over and under the car at speed. 

A diffuser is the aerodynamic component at the rear underside of a race car that helps generate downforce from the car's floor – often more efficiently than wings, since it produces less drag per unit of downforce.

Before BMW M Team WRT was confirmed as the German manufacturer’s new service provider to the factory IMSA GTP project, the team from Belgium was already laying the groundwork by assembling its staff for its first full season in American motorsport.Now that the beginning of WRT’s first season operating headquarters...