AutoTecknic Dry Carbon Intake Air Duct 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. The characteristics of carbon fiber also provide a lightweight and aesthetically appearance to the front end of the car. The item "AutoTecknic BM-0021 Carbon Fiber Intake Air Duct Fits 15-18 BMW M3 M4" is in sale since Sunday, March 25, 2018.This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Air Intake & Fuel Delivery\Air Intake Systems". The seller is "creativepowersports" and is located in Rosemead, California. This item can be shipped worldwide.