The benefits of installing the Rear Spoiler Wing At high speed, a rear spoiler can provide downforce, prevent airflow separation, and reduce drag and instability. Most people never drive their cars fast enough to experience these benefits, rather we like spoilers more for their visual benefit. If your car didn't come from the factory with a spoiler, there's no reason to do without any longer. The Rear Spoiler Wing for BMW X4 G02 can maintain the stability of the vehicle when at high speeds,reducing wind resistance,saving fuel,and keeping safety,make the driver feels more comfortable. Fitment: For BMW X4 2019 xDrive30i X Line Sport Utility 4-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC TurbochargedFor BMW X4 2019 xDrive30i Executive Sport Utility 4-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC TurbochargedFor BMW X4 2019 xDrive30i Sport Utility 4-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC TurbochargedFor BMW X4 2019 M40i Sport Utility 4-Door 3.0L 2998CC l6 GAS DOHC Turbocharged Specification: Color: Carbon fiber Black Material: Carbon Fiber Installation:Free glue tape Packaging:export carton High Quality Material & Durable This Rear Spoiler Wing for BMW X4 G02 is made of Carbon Fiber,a material that is popular in high-techs,featuring high stiffness,high tensile strength,light weight,and high-temperature tolerance.