K&N Oval Air Filter (RT-3910)

The K&N RT-3910 Custom Air Filter converts the RK-Series Air Filter Assembly (RK-3909) with a taller K&N Air Filter and longer spacers. It is designed for Harley owners who need more air for better performance.

• Replacement filter for RK-3909
• Washable and reusable
• Low restriction
• Comes with spacers and thread locker