This rear diffuser is designed for 2008 - 2013 BMW M3 E90 4DR owners who want to add a touch of style and improve their car's performance. It's perfect for those who often drive on the highway or participate in car shows. Made of carbon fiber, it's lightweight, which helps with fuel efficiency and handling. While the exact size and weight details aren't provided, you can expect a well - crafted piece that fits your BMW perfectly. Professional installation is recommended to ensure it's set up correctly.