Jcsportline Carbon Fiber Black Rear Bumper Lip Diffuser Spoiler Cover fits BMW 3 Series F80 M3 4 Series F82 M4 2015-2017 Material: Carbon Fiber.Light weight,durable and waterproof. Fitment:for BMW 3 Series F80 M3 4 Series F82 M4 318i 320i 330i 340i 435i 440i 2015-2017 Package: 1 piece of Rear Bumper Lip Diffuser. Strict quality control to meet markets requirements. Directly replace the original spoiler,fix it by screw which is included in package.Take screw to fix to better fit. Please check the item and accessories in the package. Preparatory work(electric hand drill,3MM drill,screwdriver,screws.) Rise the car with lift,dismantle the screws on the bottom of the original diffuser and remove the diffuser. Aiming at the position on the bumper,press the clips and ensure it assembly in place(if the clip is loose,can use a screw to fix it.) Install the screws on the bottom of the diffuser and the installation is complete.