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K&N RT-3910 Custom Air Filter
- Replacement filter for RK-3909
- Washable and reusable
- Low restriction
- Comes with spacers and thread locker
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.