CSP SAVINGS!

CSP2026

K&N RK-3910-1 - Oval Red 9in Intake System for Harley-Davidson

K&N  |  SKU: KN-RK-3910-1
Sale price $26499 Regular price $29149

DISCLAIMER: This Item Is Special Ordered, which may have cancellation or return restrictions. Please see our terms and conditions for more information.


PLEASE NOTE: Pictures may be representative of style, rather than the actual product. Read the description for more details.

Description

K&N RK-3910-1 - Oval Red 9in Intake System for Harley-Davidson

Assembly, Large Capacity 2-1/4"

The latest addition to K&N's RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Provides a significant airflow increase to the engine without sacrificing filtration.

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
Air Filter Color: Red
Air Filter Height: 2.188 in (56 mm)
Air Filter Material: Cotton Gauze
Air Filter Washable: Yes
CARB EO Number: D-269-35/55
Color / Finish: Red Filter, Metal Top
Estimated Horsepower Gain: 10.76 HP @ 5206 RPM
Inlet Diameter: 2.25 in (57 mm)
Mounting Hardware Included: Yes
Oil Included: Yes
Overall Height: 2.188 in (56 mm)
Package Material: Paperboard
Package Type: Box
Product Style: Motorcycle Intake System
Replacement Filter: E-3980
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 parts at knfilters.com.
Top Material: Black Powder Coated
Top Style: Metal
TUV Approved (Europe): No
Warranty: No-Hassle Lifetime Limited
Weight: 3.3 lb (1.5 kg)

What are people saying about CSP?