K&N 04-10 Harley-Davidson Sportster Replacement Air FilterK&N's high flow air filters are available as a replacement for your stock motorcycle air filter element. They are custom engineered to fit your specific application and are designed to provide low restriction and increased performance, while providing excellent engine protection for your motorcycle. Installation Instructions This Part Fits: Year Make Model Submodel 2004 2013 Harley Davidson XL1200C Sportster 1200 Custom Base 2006 2011 Harley Davidson