Carbon Fiber GT4 Style Air / Brake Duct Set - F80 M3 | F82 / F83 M4Enhance the front end of your F8X M3 or M4 with the GT4 style brake ducts. Inspired by the brake ducts found on the M4 GT4, these ducts add a motorsport influenced appearance while supporting improved airflow to the front brakes. Constructed from 100 percent genuine prepreg carbon fiber, the GT4 style brake ducts offer a lightweight yet rigid design with consistent fitment and a refined surface finish. The prepreg manufacturing process ensures uniform