K and N Harley Davidson Cleaner Assemblies are specifically designed to make your vehicle run better and perform at a higher level. K&N Harley Davidson Cleaner Assemblies are made with unique characteristics that separate them from the pack, and allow your vehicle to get better air filtration to boost your performance. K & N Harley Davidson Cleaner Assemblies have advanced filtering capabilities and will dramatically increase the air to your engine, giving it more power and extending the life of your engine.
K&N's custom air cleaner assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. These custom air cleaner assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide more air flow than other assemblies of this type
Developed around an oversized K&N High-Flow Air Filter that is designed to boost performance, filtration and service intervals
Dyno-tuned velocity stack directs airflow to engine
Aluminum backing plate provides solid mounting surface
Built in breathers replace external OE breathers
Element RT-3910 Note: Large Capacity Filter Element for RK-3909 (includes longer spacers)