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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   6 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
Replacement FilterRE-5286
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Product StyleMotorcycle Intake System
Air Filter Height5.25 in (133 mm)
Air Filter Outlet ShapeRound
Intake Pipe Color / FinishBlack
Intake Pipe MaterialDie-Cast Aluminum
Street Legal In All US States No
TUV Approved (Europe)No
Clamps Included1
Clamp StyleRegular
Clamp MaterialStainless Steel
Weight4.2 lb (1.9 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 63-1137 Air Intake Product Reviews

Tuesday, January 2, 2018 - Part 63-1137
The finish and integration on this model is spot on (looks like it should be there). Installation was easy up to the point of installing the alu tube structure. The 4 cap nuts were just a pain to get started and then you had to have a small box wrench to complete the tightening. I like the way it looks with those cap nuts recessed, but boy are they difficult to get engaged.

Mark Dunham
Mesa, Arizona
Friday, September 22, 2017 - Part 63-1137
Good Product looks good on the bike.

Roger Chiddle
United Kingdom
Wednesday, August 2, 2017 - Part 63-1137
Awesome air filter, I am very happy with it. Once I installed my D&D and K&N filter, my bike was a totally different animal. Thanks K&N.

Lee Marrero
Kiamesha Lake, New York
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