The K&N FilterCharger® air filter delivers high air flow and crucial filtration for engine longevity. OE replacement filters add 1-4 horsepower, thanks to our unique cotton medium originally developed for motocross racing. Washable and reusable, the filter lasts the life of your vehicle, with four to six pleated and oiled cotton gauze layers protected by aluminum wire mesh. Ideal for racing and off-road environments, this filter increases air intake and safeguards your engine.