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K&N 63-1138C Air Intake

Performance Products > Performance Air Intake System
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Chrome finish aluminum tube with high quality finish
  • Washable and reusable lifetime air filter
  • Not legal for highway use in states adopting California emission regulations
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • Easy to install, usually in 90 minutes or less
  • K&N Million Mile Limited Warranty
The K&N 63-1138C Air Intake fits some Harley Davidson FLDE Deluxe, Harley Davidson FLFB Fat Boy, Harley Davidson FLFBS Fat Boy, Harley Davidson FLHC Heritage Classic, Harley Davidson FLHR Road King, Harley Davidson FLHRXS Road King Special, 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, and Harley Davidson FXLR Low Rider models. See vehicle applications link for details.
K&N AirCharger Air Intakes for select Harley-Davidson Touring, Softail, Twin-Cam and Sportster motorcycle models increase power by eliminating the restrictive stock OE air cleaner and replacing it with a K&N High-Flow Air Filter and a chrome finish mandrel bent aluminum intake tube. These intakes come with a billet aluminum throttle-body mounting plate and mounting hardware. K&N High-Flow Intake Systems give your Harley an aggressive appearance while providing a significant increase in airflow resulting in more power. They are not legal for use in California and other states adopting California emission standards.


Product Specifications

Estimated Horsepower Gain5.97 HP @ 4812 RPM
Replacement FilterRC-3680
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Product StyleMotorcycle Intake System
Air Filter Outlet ShapeRound
Intake Pipe Color / FinishPolished
Intake Pipe MaterialAluminum
Street Legal In All US States No
TUV Approved (Europe)No
Clamps Included1
Clamp StyleRegular
Clamp MaterialStainless Steel
Weight3 lb (1.4 kg)
Product Box Height4.88 in (124 mm)
Product Box Length11.75 in (298 mm)
Product Box Width9.5 in (241 mm)
California RestrictedNot legal for sale or use in California
Couplers IncludedNone
Mounting Hardware IncludedYes
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N 63-1138C Air Intake Product Reviews