This is a brand new BMW brand carbon fiber rear diffuser for a 2018 and newer BMW F90 M5. This diffuser comes brand new in original BMW packaging. If you’ve seen the BMW M Performance aerodynamic enhancements on a BMW before then you know how dramatic of a difference it makes. It’s a very sexy enhancement. Check out our extensive selection of great BMW parts and accessories by going to our store. Track Page Views With. Auctiva’s FREE Counter. The item “BMW Brand OEM F90 M5 2018+ M Performance Carbon Fiber Rear Bumper Diffuser NEW” is in sale since Wednesday, October 24, 2018. This item is in the category “eBay Motors\Parts & Accessories\Car & Truck Parts\Exterior\Spoilers & Wings”. The seller is “euroactive” and is located in Olyphant, Pennsylvania. This item can be shipped worldwide.