A diffuser element is a part or component that spreads or scatters something, like light or air, in different directions. It helps to evenly distribute or disperse the substance it is diffusing. Full definition
The spoiler hanging off the top of the hatch is now finished in black as well, while the lower diffuser element also gets a black finish. (topspeed.com)
In typical Mercedes fashion, the new E43 Estate features a more aggressive front end with the standard AMG grille, a set of stylish wheels on the side, and a nice diffuser element with revised exhaust outlets in the rear. (topspeed.com)
Further back, there are widened front and rear fenders, chunkier sills underneath the doors, an RS7 badge attached to the trunk lid and a deeper rear bumper that incorporates a more prominent diffuser element and houses two large tailpipes. (autoweek.com)