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K&N Air Intake Systm KN for Harley-Davidson Road Glide/Softail/Heritage RK-3955S

K&N Air Intake Systm KN for Harley-Davidson Road Glide/Softail/Heritage RK-3955S

The K&N RK-3955S Intake System-Harley Davidson fits some Harley Davidson FLDE Deluxe, Harley Davidson FLFB Fat Boy, Harley Davidson FLFBS Fat Boy, Harley Davidson FLHC Heritage Classic, Harley Davidson FLHCS Heritage Classic, Harley Davidson FLHR Road King, Harley Davidson FLHRXS Road King Special, Harley Davidson FLHTCU Electra Glide Ultra Classic, Harley Davidson FLHTCUTG Tri Glide Ultra, Harley Davidson FLHTK Ultra Limited, Harley Davidson FLHTKL Ultra Limited Low, Harley Davidson FLHX Street Glide, Harley Davidson FLHXS Street Glide Special, Harley Davidson FLRT Freewheeler, Harley Davidson FLSB Sport Glide, Harley Davidson FLSL Softail Slim, Harley Davidson FLTRU Road Glide Ultra, Harley Davidson FLTRX Road Glide, Harley Davidson FLTRXS Road Glide Special, Harley Davidson FXBB Street Bob, Harley Davidson FXBR Breakout, Harley Davidson FXBRS Breakout, Harley Davidson FXFB Fat Bob, Harley Davidson FXFBS Fat Bob, Harley Davidson FXLR Low Rider, and Harley Davidson FXLR Low Rider Custom models. See vehicle applications link for details.

K&N Street Metal Air Intake Systems for Harley Davidson Dyna, Softail, Touring and Twin-Cam Model motorcycles increase power by eliminating the restrictive stock OE air cleaner and replacing it with an oversized K&N High-Flow Air Filter and a cast aluminum high-volume aluminum housing. K&N high-flow intake systems give your Harley an aggressive appearance while providing a significant increase in airflow resulting in more power.

Product Overview


Guaranteed to increase horsepower
Designed to improve throttle response and engine sound
Cast aluminum high-volume, performance air intake housing
Washable and reusable K&N High-Flow cotton air filter that provides outstanding performance and protection
Integrated internal velocity stack
Built-in breathers replace external OE breathers
Easy to install, usually in 90 minutes or less

Product Specification

Estimated Horsepower Gain 3.33 HP 4710 RPM
Replacement Filter E-3987
Air Filter Color Red
Air Filter Material Cotton Gauze
Warranty 1,000,000 Miles/10 Year
Product Style Motorcycle Intake System
Air Filter Height 2.469 in (63 mm)
CARB EO Number D-269-60
Street Legal In All US States See Vehicle Applications
TUV Approved (Europe) No
Overall Height 3.25 in (83 mm)
Top Material Silver Powder Coated
Package Contents 1 Air Filter
Package Quantity 1
Weight 5 lb (2.2 kg)
Product Box Height 9.5 in (241 mm)
Product Box Length 11.9 in (302 mm)
Product Box Width 4.8 in (122 mm)
Mounting Hardware Included Yes

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