The KN 57-1133 cold air intake system replaces the factory air filter and air intake housing in many Polaris Ranger RZR models for a guaranteed increase in horsepower and torque. A free-flowing aluminum intake tube helps increase the volume of airflow to your engine. The system is paired with a washable, reusable High-Flow Air Filter featuring oiled cotton filter media, which is protected by a foam wrap and an enclosed filter housing for additional protection from heat and the elements. The oversized, conical filter design allows you to go up to 100,000 miles between filter services under normal highway driving conditions. Can typically be installed in 90 minutes or less using standard hand tools. Legal in all 50 States.