The AutoTecknic Carbon Fiber Air Intake Duct - BMW F80 M3 |BMW F82/ F83 M4 are designed to mount behind the front grills of your F80 M3 and F82/ F83 M4 to provide a "ram-air" effect by utilizing the air intake motion to increase the static air pressure entering the intake manifold under the bonnet. This creates greater airflow throughout the engine by forcing in increased cooler air, resulting in lower engine temperature.

Available in Carbon Fiber, or Red Kevlar. 

The characteristics of carbon fiber also provide a lightweight and aesthetically appearance to the front end of the car.