Kohlenstoff F8X M3 / M4 Carbon Rear Diffuser + LED Brake Lamp
*NO LONGER AVAILABLE*
Kohlenstoff, a unique Japanese company brings us the most interesting diffuser for the F8X M3 and M4 that we've seen. 2x2 carbon weave wraps around a third LED brake lamp and extends to the outer edges of the rear bumper cover.
DIY installation instructions and photographs are available here: