For BMW 3 Series F30 F31 2012-2018. Front Axle Differential Fit For BMW X5 X6 F15 F16 F32 F30 320i 328i 2006-2018. Type: Rear Bumper Diffuser. 1 Rear Bumper Diffuser. With the reduction of drag and the increase in downforce, Rear Bumper Diffusers significantly enhance the vehicle's high-speed stability.
