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K&N Red Intake System for Harley Davidson - RK-3909-1 for 2000-2012 Harley-Davidson FLSTC Heritage Softail Classic - front vi
K&N Red Intake System for Harley Davidson - RK-3909-1 for 2000-2012 Harley-Davidson FLSTC Heritage Softail Classic - angle vi
K&N Red Intake System for Harley Davidson - RK-3909-1 for 2000-2012 Harley-Davidson FLSTC Heritage Softail Classic - detail v

K&N Engineering Part # KNNRK-3909-1

K&N Red Intake System for Harley Davidson - RK-3909-1

$440.99 CAD
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Canadian since 2005Mississauga, Ontario
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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 Height: 1.625 in (41 mm)
  • Overall Height: 1.688 in (43 mm)
  • Inlet Diameter: 2.25 in (57 mm)
  • Neck Flange: 2.25 in (57 mm)
  • Weight: 3.3 lb (1.5 kg)
  • Estimated Horsepower Gain: 6.05 HP @ 5206 RPM
  • Air Filter Inside Diameter: 6.188 in (157 mm)
  • Size: 7 Inch
  • Top Material: Black Powder Coated
  • Air Filter Material: Cotton Gauze
  • CARB EO Number: D-269-35/55
  • Replacement Filter: E-3972
  • Top Style: Metal
  • Air Box Included: No
  • Mass Air Flow Sensor Adapter Included: No
  • Clamps Included: No Clamps Included
  • Clamp Material: No Clamps Required
  • Clamp Style: No Clamps Required
  • Warranty: No-Hassle Lifetime Limited
  • Clamp Color/Finish: Not Applicable
  • Air Filter Outlet Shape: Not Flanged
  • Style: Oval
  • Air Filter Color: Red
  • Color / Finish: Red Filter, Metal Top
  • Air Filter Shape: Round
  • Oil Included: Yes
  • 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

Free Canadian shipping on qualifying orders $399+, with no duties or brokerage. Special order and made-to-order items can't be cancelled or refunded once ordered. Oversized items may have a handling fee depending on your location; pickup in Mississauga has no fee.

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