Double Diffuser

A Double Diffuser is an aerodynamic device located at the rear underside of a race car that creates additional downforce by incorporating a second channel for airflow.

First introduced prominently in Formula 1 during the 2009 season, this clever design exploited a regulatory loophole. While standard diffusers manage airflow under the car to create downforce, the double diffuser added a second channel that dramatically increased this effect without technically breaking the rules.

The Brawn GP team gained significant advantage with this innovation, helping them win the championship. The double diffuser created so much additional grip that it allowed cars to corner faster and maintain stability. The design was eventually banned in 2011 after other teams protested its legality.