The For BMW M3 F80 F82 F83 M4 MP Style carbon fiber rear diffuser lip 15-19 is an aftermarket car part designed to fit on BMW M3 and M4 models produced between 2015 and 2019. The rear diffuser lip is made from carbon fiber, a lightweight and strong material that is often used in high-performance automotive applications. The MP style diffuser is designed to enhance the car's aerodynamics, by redirecting airflow under the car to reduce drag and increase downforce. This can help to improve the car's stability and handling at high speeds, making it more suitable for track use. The rear diffuser lip is designed to replace the OEM (original equipment manufacturer) rear diffuser on the BMW M3 or M4, and is intended to provide a more aggressive, sporty look to the vehicle. It is a popular aftermarket modification among car enthusiasts who want to personalize and upgrade their BMW M3 or M4.