Audi A4 S4 B9 Sline Carbon Fiber Rear Trunk Spoiler Lip Exterior Mods Carbon Fiber B9 S4 Car Spoiler for AUDI A4 S4 S Line Sedan 4 Door 2017 Audi Carbon Fiber M4 Style Rear Spoiler for B8.5 A4 M4 Style Dry Carbon Fiber Trunk Wing Boot Lip Rear Spoiler Ducktail For Audi B9 A4 M4 Style Carbon Fiber Trunk Lip Spoiler Audi B9 A4 S4 Carbon Fiber Trunk Lip Spoiler. NWCarbon Haus A5 B9 4 door M4 Style Dry Carbon Fiber Spoiler. Constructed of pre preg carbon fiber using state of the art technology to ensure perfect fitment and quality every time. Lead time 3 4 weeks.