Check the listing for details. Polaris Heavy Duty Performance Engine Air Filter for RZR. Condition: New. Listed at 79.99 USD. This Polaris HD Air Filter was purpose-built for those riding in extreme dust environments. Made of Ultra-Web HD media with smaller but stronger fibers, consistently spaced, this filter will provide better protection without creating additional restriction for air flow. While most aftermarket brands fall below the Polaris requirement of 99.5% filtering efficiency to protect your engine, the Ultra-Web HD media has been independently verified to remove 99.999% of airborne contaminents. All that protection while maximizing airflow, increasing both horsepower and acceleration. If you are looking for the best of the best, you've come to the right place. Changing your filter is one of the easiest and fastest forms of vehicle maintenance.