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K&N Air Intake System for Harley-Davidson Street Glide/Softail/Low Rider RK-3956

K&N Air Intake System for Harley-Davidson Street Glide/Softail/Low Rider RK-3956

The K&N RK-3956 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 motorcycles replace the restrictive stock OE air cleaner with an oversized K&N High-Flow Air Filter and a high-volume cast aluminum housing. If you’re looking for an aggressive appearance but want a significant increase in airflow, resulting in more power, this high-flow air intake system is exactly what your Harley needs. Installation is so simple, it can usually be done in 90 minutes or less. The K&N air filter is washable, reusable, pre-oiled and ready for installation. This intake system features an updated, modern look with an oval-shaped matte black housing. Silver details and sanded fins further enhance the streamlined look. Internal breathers provide a sleek, clean appearance. This air intake has a classic styling with a savage appeal. These K&N air intakes are street legal in most states.

They are not legal for use in California and other states adopting California emission standards.

Product Overview


Guaranteed to increase horsepower
Designed to improve throttle response and engine sound
Cast aluminum high-volume, performance air intake housing in black
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 5.19 HP 4981 RPM
Replacement Filter E-3988
Air Filter Color Red
Air Filter Material Cotton Gauze
Warranty 1,000,000 Miles/10 Year
Product Style Motorcycle Intake System
Air Filter Height 2.406 in (61 mm)
CARB EO Number D-269-60
Street Legal In All US States See Vehicle Applications
TUV Approved (Europe) No
Overall Height 4.25 in (108 mm)
Top Material Black Powder Coated
Package Contents 1 Air Filter
Package Quantity 1
Weight 4.3 lb (1.9 kg)
Product Box Height 4.88 in (124 mm)
Product Box Length 12 in (305 mm)
Product Box Width 9.5 in (241 mm)
Mounting Hardware Included Yes

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