Blox Racing Vortex Generators work in tandem with an OEM or aftermarket wing to improve downforce. Sports sedans often have a steep rear windscreen, causing a condition where air prefers to travel straight backward off the roof, rather than following the contours of the vehicle. To get the most out of a spoiler or wing, air must travel down the back window and over the trunk lid. A vortex generator does just that – it encourages airflow over the rear lines of the car.