BU-9003 K&N Buell Air Filter Element 2003-2010 XB Models (L2E4)
K&N high flow air filter element.
Never need to buy a new filter again, just clean it with K&N air filter cleaner and re-oil it with K&N air filter oil and you're good to go!
This fits into the factory air box without any modifications to the filter or air box.
2003-2010 XB Models