Rear Carbon fiber diffuser - Matte BMW M2 (F87)MFG# DI BM CA 3 M WEIGHT 0. 1kg The stunning carbon fibre diffuser is offered as an option with the choice of a high gloss or matt finish. It is a completely new design from the one that comes as standard on the car, and it gives the rear of the M2 a more aggressive and sporty feel. It shows off the tailpipes to their full extent and is a perfect accompaniment to the side mirror caps.