This rear diffuser is great for BMW X5 owners from 2014 - 2018 who want to enhance their car's appearance and performance. You can use it when driving on the road or showing off your car at car meets. It's made of carbon fiber, which is light but strong. It comes in 3 pieces and is designed to fit all 2014 - 2018 BMW X5 models. The manufacturer part number is 118089.