GENUINE BMW M PERFORMANCE REAR DIFFUSER, MPA, CARBON FIBRE, 51192459740. We offer for sale this genuine BMW 3 Series (G20, G21) item, new and unused in original BMW packaging. THIS LISTING IS FOR. 1 x M Performance Rear Diffuser, MPA, Carbon Fibre. Some specifications of the following BMW vehicles. 3' G20 Sedan (01/2018 -).