Akrapovic Rear Carbon Fibre Diffuser - MatteThe 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 Competition 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. Technical Data: Unit Stock Akrapovic Max gain kg 0. 8 0. 7 0. 1 lb 1. 8 1. 5 0. 3 % 12.