Stage 2 Oval Performance Air Filter Kits for factory oval HD air cleaners both increase performance & add style to the engine Features a performance filter with a pleated top to take in air from the sides & top of the filter for maximum airflow Filter cover, spacers & clamps are all CNC machined from billet aluminum Performance air filter is made from high-flow black pre-oiled cotton media Increased filter height specially designed to increase airflow without reducing leg room Over 50% more air filter surface area than paper filters found in factory oval air cleaners 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 kit includes a performance filter, billet air cleaner cover, billet spacers & clamps Finish: Red anodize Fitment: Oval Screaming Eagle Ventilator air cleaners & M8 special / ST models equipped with HD oval Ventilator air cleaner backing plates