A diffuser is an object or device that spreads or scatters something in different directions. It is used to disperse light, air, or other substances evenly to create a softer or more balanced effect. Full definition
Race inspired rear diffuser with integrated F1 - brake light and an aggressive stance. (ps-garage.com)
It comes in the form of a plug - in diffuser and sprays. (petremedyusa.com)
Furthermore, it will get more aggressively styled bumpers, bigger and much more attractive wheels, rocker panels, rear diffuser with quad pipes and a lowered stance. (carannouncements.com)