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K&N 63-1137 Air Intake

Performance Products > Performance Air Intake System
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.7 out of 5 stars   3 Customer Reviews
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Cast aluminum high-performance intake tube
  • 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
  • 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 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 cast aluminum intake tube. These intakes come with an die-cast 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. 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.

[More Info on AirChargers for Harley-Davidson Motorcycles]

Product Specifications

Estimated Horsepower Gain5.35 HP @ 4758 RPM
Air Filter ColorRed
Air Filter Height5.25 in (133 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
California RestrictedNot legal for sale or use in California
Clamp MaterialStainless Steel
Clamp StyleRegular
Clamps Included1
Intake Pipe Color / FinishBlack
Intake Pipe MaterialAluminum
Product Box Height4.88 in (124 mm)
Product Box Length11.75 in (298 mm)
Product Box Width9.5 in (241 mm)
Product StyleMotorcycle Intake System
Replacement FilterRE-5286
Street Legal In All US States No
TUV Approved (Europe)No
Weight4.2 lb (1.9 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N 63-1137 Air Intake Product Reviews

Friday, December 23, 2016 - Part 63-1137
Amazing. Immediate difference off the line, wide open and cruising. Throttle response is instantaneous. Take a before and after video of your bike for sound, you won't believe the difference. Highly recommend remapping after you install, you don't have to but you'll feel it when you do. After installing this, a Power Commander and S&S cams, my Softail screams like it's on fire and eats up Dynas for breakfast.

Wednesday, September 21, 2016 - Part 63-1137
Great product and quality materials, gives the bike a more aggressive look and improves engine response, especially at wide open. Sounds great as the bike accelerates. Highly recommend this product to any HD owner.

Eric Rodriguez
Wesley Chapel, Florida
Monday, August 22, 2016 - Part 63-1137
I like this air filter very much. However, the acorn nuts that are supplied are very difficult to screw on because of such little clearance. Other than that, this is a great piece .

Philip Whalen
Chesapeake, Virginia