Polaris RZR Aluminum Cold Air IntakeForce Turbo's Polaris RZR Aluminum Cold Air Intake, made from 3" aluminum, increases airflow from airbox to turbo and lowers intake charge tube temperatures. SIDE PORTS: No Side Port: This cold air intake fits the application where a crankcase breather or recirculating BOV port is not needed. Single Side Port: This cold air intake includes one side port for a crankcase breather only. Made for those who have a BOV that relieves to the atmosphere. Dual