K&N Air Filter For Fuel-Injected Harley Big Twin Evo K&N Air Filters are crafted for an optimal blend of high air flow and superior filtration, crucial for engine longevity. Stemming from the rigorous demands of desert motocross racing, their distinctive filter medium utilizes several layers of cotton gauze situated between aluminum wire mesh. This combination is pleated and oiled, boosting its filtering capability and overall efficiency. Engineered for scenarios where maximum horsepower and rapid acceleration are essential, alongside safeguarding against dust and debris, K&N Air Filters offer a significant increase in air intake while being washable and reusable, ensuring engine protection throughout its lifespan. These filters are made for easy installation as a direct replacement in your motorcycle, maintaining the original airbox with no need for custom changes. However, adjusting the fuel delivery system with a fuel controller or re-jetting might be necessary to complement exhaust or intake modifications. Features: The original high-flow air filter invented by K&N A perfect upgrade for 2-up rides on your V-Twin motorcycle with filled saddle bags, a long life high-flow air filter delivers improved performance and excellent protection for the life of your motorcycle Delivers improved performance and excellent protection for the life of the bike Provides low restriction for increased airflow Includes a large filtration area that delivers high capacity and long service intervals, provided by pleated media Years of protection without corrosion provided by durable Zinc coated top plates Specifically designed to fit OE air filter assembly Pre-oiled and ready for immediate use Replaces OEM 29291-95