Use this rear diffuser when you want to upgrade the look and performance of your 2014 - 2018 BMW X5. It's perfect for car enthusiasts who love to customize their vehicles. The diffuser is made of FRP material, which is both lightweight and durable. It has an AF - 1 style that gives your car a wide - body and aggressive appearance. As for the technical part, it comes as a single - piece (S) unit and has a Manufacturer Part Number of 112663.