BRAND NEW PART # 600-099 Performance air filter upgrade for factory HD Ventilator 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 Dyna 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