GENUINE BMW M PERFORMANCE REAR DIFFUSER, CARBON FIBRE, 51125B30F59. We offer for sale this genuine BMW 1 Series (F70) 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. 1′ F70 (03/2023 -). Brand new, unused item in original packaging. Buyers outside of the United Kingdom.