GENUINE BMW M PERFORMANCE REAR DIFFUSER, CARBON FIBRE. 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, Carbon Fibre. Some specifications of the following BMW vehicles. 3′ G20 Saloon (10/2017 – 06/2022). 3′ G21 Touring (05/2018 – 06/2022). Brand new, unused item in original packaging. Buyers outside of the United Kingdom.