BMW F8x PSM Style Rear Carbon Fiber Diffuser (M3/M4)Transform both the aerodynamics and look of your F8x M3 M4 with the PSM Style Rear Carbon Fiber Diffuser! Fitment: 2015 2020 F80 M3 F82 & F83 M4 Perhaps the best aero component that gives the F80 F82 F83 M3 M4 rear the treatment it deserves. Arguably the biggest change you can make for both looks and aerodynamics. This 5 piece carbon fiber diffuser is made to fit all F8X vehicles and comes with the necessary hardware. Installation will require an