K&N Buell Firebolt/Lightning/Ulysses 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. This Part Fits: Year Make Model Submodel 2005 2007,2009 2010 Buell Lightning CityX XB9SX Base 2004 2010 Buell XB12R Firebolt Base 2004 2008 Buell XB12S