Performance V1 Carbon Fiber Rear Diffuser Extension Set - G80 M3 | G82 / G83 M4Carbon fiber rear bumper extensions help give the rear end of your G8X M3 M4 a more aggressive, aftermarket look. These extensions are made of 100% genuine carbon fiber and help complement the already aggressive body lines of the G8X M3 and M4. Each piece is constructed using genuine, 2x2 carbon fiber. A high quality clear coat comes standard to help prevent damage from harmful UV rays and minor road debris. Installation is relatively straightforward