K N Air Filter Assembly Twin Cam 2-1/4″ RK-3910-1

Oversized black powder-coated aluminum backing plate provides solid mounting, Fits behind the OE air cleaner cover maintaining the factory appearance, Replaces the stock air filter and cleaner backing plate assembly, Washable, oversized KN high flow air filter equals longer life, Dyno tuned velocity stack directs airflow to engine, Built in breathers replace external OE breathers, Guaranteed increase in horsepower, Does not include cover, Made in the U.S.A.