The Z4 rear quad diffuser has fins that extend out from the rear bumper to smooth and channel air flow from under the car into the low pressure area behind your vehicle as it moves at higher speeds. In concert with other aerodynamic components, our diffuser results in more stability and higher speeds and cooling effect to the rear differential.

- Fit the stock bumper
- Vacuum Infused Gloss or *Matt Carbon
- Available in FRP and Carbon Fiber