The 1-PC style VRS type Carbon fiber rear bumper diffuser lip spoiler for BMW F80 F82 F83 M3 M4 15-18 is another aftermarket car part designed to fit on BMW M3 and M4 models produced between 2015 and 2018. Similar to the previous product, the rear bumper diffuser lip spoiler is made from carbon fiber, a lightweight and strong material that is often used in high-performance automotive applications. The VRS style diffuser is designed to improve the car's aerodynamics by creating a low-pressure zone under the car to increase downforce and improve stability at high speeds. This particular rear bumper diffuser lip spoiler is a 1-piece design and is intended to replace the OEM (original equipment manufacturer) rear bumper diffuser on the BMW M3 or M4. The VRS style is known for its aggressive and sporty look and is a popular aftermarket modification among car enthusiasts who want to personalize and upgrade their BMW M3 or M4.