Definition
Diffusers work best with flat floors and minimal turbulence upstream.
Street cars often use cosmetic diffusers without full aero integration.
Automotive Wiki
Body & Aero
Diffuser
An underbody expansion accelerating air exit at the rear, reducing pressure and adding downforce.
Related terms
- DownforceAerodynamic load pushing the car toward the ground at speed, increasing grip.
- Front SplitterA horizontal extension under the front bumper creating low-pressure airflow and …
- Rear WingAn airfoil mounted on the trunk or hatch producing rear downforce.
- Widebody KitFlared fenders and extended panels covering wider wheels and tires.
- Roll CageA welded tubular structure protecting occupants and stiffening the chassis in im…
- Hood VentAn opening or duct extracting hot air from the engine bay for cooling.
Category: Body & Aero · Updated August 31, 2026