Universal Control Arm Ducts with 50mm outlet. Especially suited for cars with limited space such as BMW F87 M2, F80/F82 M3 M4 etc. Compatible with most BMWs. *Not compatible with E46 These ducts are used to increase airflow to your brakes. This will help cool the brakes, increasing the longetivity of your pads and reduce brake fade. The ducts have a high quality smooth finish and are made out of carbon fiber reinforced plastic. Diameter of 50mm. We also sell the air tubing and cooling plates for bmw separately in our shop. The ducts have lots of adjustments and can be mounted on any car, using the included tie wraps. Price is per pair and it's only available as a set of ducts The duct set includes: Universal duct left side Universal duct right side Reusable zip-ties (2 per side)