• Arlen Ness performance air filter upgrade for factory HD Ventilator® oval air cleaners and M8 "special" models equipped with factory oval air cleaners
• Each filter is made from high-flow black pre-oiled cotton media wrapped in a stainless-steel jacket for optimum airflow with a unique look 
• Increased filter height specially designed to increase airflow while fitting into the factory backing plate & accepting the factory outer cover 
• Over 22% more air filter surface area than filters found in factory oval air cleaners, each filter's high-flow performance filter media drastically improves airflow as well 
• Dyno testing has shown up to a 3hp increase after installing the upgrade filter  on factory displacement M8 engines; up to 5hp gain for 124” big bore M8 engines
• Each filter includes internal spacers & everything needed for quick & easy installation
• Fitment: Oval Screaming Eagle® Ventilator® air cleaners & M8 special / ST models equipped with factory oval air cleaners
• Replaces OEM #'s: 29400267, 29400293, 29400298, 29400299

California Air Resource Board: Executive Order D-639-10