Flat shape carbon fiber side skirt extensions rocker panel is an aftermarket modification designed for the BMW G80 M3 and G82 M4 models from 2020 onwards. It is made of lightweight and strong carbon fiber material and is intended to attach to the bottom of the car's side skirts to enhance the car's appearance and improve aerodynamics. The advantages of installing flat shape carbon fiber side skirts extensions rocker panels on a BMW G80 M3 or G82 M4 2020+ include: 1. Improved aerodynamics: The side skirt extensions can reduce drag and improve airflow, which can lead to better fuel efficiency and handling. 2. Enhanced appearance: The carbon fiber material provides a sleek, sporty look that can make the car stand out from others on the road. 3. Increased stability: The side skirt extensions can help improve the car's stability and grip on the road, particularly at high speeds or in tight turns. 4. Lightweight and strong: Carbon fiber is a lightweight, durable material that can withstand the stresses of driving without adding significant weight to the car.