For BMW F10 / F11 with rear M-sport bumper M5 style diffuser
BMW M5 F10 CARBON FIBRE DTM REAR BUMPER DIFFUSER 2 FIN | eBay
3DDesign diffuser BMW M5 F10 in carbon - Baan Velgen
Amazon.com: NINTE Rear Lip Fits for BMW 5 Series F10 M Sport Bumper 2011-2016, Painted Gloss Black F90 M5 Style Quad Exhaust Bumper Diffuser : Automotive
BMW 5 SERIES F10 F11 REAR DIFFUSER WITH LED LIGHT M5 LOOK GLOSS BLACK 2010-2017 – Fastlane Styling
E60 M5 Rear Diffuser Review | BMW M5 Forum and M6 Forums