Polaris RZR Pro R Pre Air Box High Flow IntakeThe Polaris RZR Pro R Pre Air Box High Flow Intake tube is made for the customer who needs the most performance while still running the stock air box. With a 25% larger pipe diameter and long flowing bends, this product supplies significantly more air to the motor than stock. When adding performance upgrades to the RZR Pro R, customers often find that the stock plastic pipe cannot keep up with the needed airflow. Specifications: 4" aluminum tube 4 ply