K&N RK39091 Air Filter Harley Davidson

K&N

Usually ships in 2-3 days

K&N's RK Series was developed to get more horsepower from your Twin Cam Harleymodel_engine. Built around the legendary K&N High-Flow Air Filter, the this RK Series assembly includes an innovative powder coated billet aluminum backplate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover. The RK-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1.

Part RK-3909-1 Product Specifications
Product Style: Motorcycle Intake System
Estimated Horsepower Gain: 6.05 HP @ 5206 RPM
Street Legal In All US States: See Application Link Below
TUV Approved (Europe): No
Air Filter Shape: Round
Color: Red
Filter Height: 1.625 in (41 mm)
Neck Flange: 2.25 in (57 mm)
Overall Height: 1.688 in (43 mm)
Replacement Filter: E-3972
Size: 7 Inch
Style: Oval
Top Material/Finish: Black Powder Coated
Top Style: Metal
Weight: 3.3 lb (1.5 kg)
Product Box Length: 11.75 in (298 mm)
Product Box Width: 9.5 in (241 mm)
Product Box Height: 4.88 in (124 mm)



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