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Intake System-Harley Davidson
SKU
RK-3909-1
K&N's RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Built around the legendary K&N High-Flow Air Filter, the this RK Series assembly includes an innovative powder coated billet aluminum back plate 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.
- Designed to increase horsepower & torque
- Dyno-tuned velocity stack
- Washable and reusable
- Excellent air filtration
| Estimated Horsepower Gain | 6.05 HP @ 5206 RPM |
| Replacement Filter | E-3972 |
| Air Filter Color | Red |
| Air Filter Material | Cotton Gauze |
| Warranty | No-Hassle Lifetime Limited |
| Product Style | Motorcycle Intake System |
| Size | 7 Inch |
| Air Filter Shape | Round |
| Air Filter Height | 1.625 in (41 mm) |
| Air Filter Inside Diameter | 6.188 in (157 mm) |
| Air Filter Outlet Shape | Not Flanged |
| CARB EO Number | D-269-35/55 |
| Street Legal In All US States | Not legal for sale or use in California on any pollution controlled motor vehicle. NOTE: Some specific models and years may be legal in CA. Check the CARB status on your vehicle in the applications listings. |
| TUV Approved (Europe) | No |
| Inlet Diameter | 2.25 in (57 mm) |
| Overall Height | 1.688 in (43 mm) |
| Top Style | Metal |
| Top Material | Black Powder Coated |
| Clamps Included | No Clamps Included |
| Clamp Style | No Clamps Required |
| Clamp Material | No Clamps Required |
| Weight | 3.3 lb (1.5 kg) |
| Product Box Height | 4.88 in (124 mm) |
| Product Box Length | 11.75 in (298 mm) |
| Product Box Width | 9.5 in (241 mm) |
| Couplers Included | None |
| Mounting Hardware Included | Yes |
| Neck Flange | 2.25 in (57 mm) |
| Style | Oval |
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