K&N 56-9310 Custom Racing Assembly SDR-6 DIA 1-3/4" HDescription K&N 56 9310 Custom Racing Assembly SDR 6 DIA 1 3 4" H K&N custom air filter kits are designed to boost performance from single or two barrel carburetors while keeping dirt on the outside. These assemblies include custom chrome top and base plates along with the K&N High Flow Washable Air Filter. The filter is washable and reusable, offering high airflow with excellent filtration. The show quality chrome finish enhances appearance, and the