AutoTecknic Dry Carbon Competition Brake Air Ducts - F80 M3 | F82/ F83 M4Product Description Check out AutoTecknic's newly developed dry carbon fiber competition brake air ducts for the F80 M3 F82 and F83 M4. Like the brake air ducts found on the factory GT4 race car it's designed to mount directly onto the front bumper on the F80 M3 F82 and F83 M4. Dry carbon fiber's name comes from its manufacturing process. Dry carbon fiber is formed by using a "pre preg" or impregnated piece of carbon materials. This piece of carbon is