The Carbon Fiber Rear Bumper Lip Diffuser Spoiler for BMW F90 M5 is an aftermarket aerodynamic upgrade part made from carbon fiber that is designed to be installed on the rear bumper of a BMW F90 M5. Its purpose is to enhance the car's appearance and performance by improving aerodynamics, reducing drag, and increasing downforce. The advantages of installing a Carbon Fiber Rear Bumper Lip Diffuser Spoiler on a BMW F90 M5 include: 1. Improved aerodynamics: The spoiler is designed to reduce drag and improve the car's stability at high speeds. 2. Increased downforce: The spoiler generates downforce, which helps to keep the car's rear end planted to the ground, improving traction and handling. 3. Enhanced appearance: Carbon fiber is a lightweight and durable material that gives the car a sleek and sporty look. 4. Durability: Carbon fiber is a strong and durable material that is resistant to corrosion, weathering, and UV radiation, making it a long-lasting upgrade for your BMW F90 M5.