Build Your Own Carbon Fiber Aero Kit - F8X M3/M4Build Your Own F8X Carbon Fiber Aero Kit Create a fully custom exterior transformation for your F80 M3, F82 M4, or F83 M4. This kit lets you mix and match any carbon fiber piece from our entire F8X lineup to build the exact look you're after, whether that's subtle OEM+ refinement or full on track ready aggression. Every component is constructed from high quality carbon fiber and finished with a UV protectant gloss coat for lasting durability and rich