Applicable Models: Air intake duct is fit for 3 Series 320i Base 2013 to 2018, for 3 Series 328i Base Sedan 2013, and for 3 Series ActiveHybrid 3 Base 2013 to 2015. Item Type: Air Intake Duct. Main Function: The air intake ducts set effectively releases heat and pressure generated during the braking process to ensure the proper functioning of the braking system, thus maintaining the effectiveness and safety of the brakes.