2013-2016 B8.5 Audi A4/S4 - Carbon Fiber Rear Diffuser - V1 – Canadian Auto Performance
Karbel Carbon Dry Carbon Fiber Rear Diffuser for Audi S4 & A4 S Line 2 – Performance SpeedShop
Caractere Rear Diffuser with 2 Cuttings, fits Audi S4 B8.0 - BK-Motorsport
Amazon.com: JC SPORTLINE Carbon Fiber Rear Diffuser for Audi A4 B8 Standard Sedan 2009-2012 Rear Bumper Diffuser Lip Spoiler Factory Outlet (Style A) : Automotive
Carbon Fiber Rear Diffuser for 2013-16 Audi S4/A4 [B8.5] by DEVAL D28244
ECS - 028808ECS01 - Audi B8 S4 / A4 S-Line Rear Diffuser - Gloss Black