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Diffuser
Diffuser (automotive) - Wikipedia
Aero Function® - Rear Diffuser
What Is The Function of A Car Rear Diffuser? - Winn Autosports
Carbon fibre rear diffuser
What Is The Function of A Car Rear Diffuser? - Winn Autosports
The Physics of Diffusers: How to Make a Car Really Suck – Feature – Car and Driver