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K&N 77-1540KP Be the first to review!
Intake Kits > Performance Intake Kit

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Built for performance and show utilizing the highest quality components, the K&N 77 Series High-Flow Performance Air Intake is a free-flowing mandrel-bent aluminum tube induction system designed for Trucks and Sport Utility Vehicles. 77-Series air intakes come with K&N's Million Mile Limited Warranty. K&N intake systems replace your vehicle's restrictive factory air filter and air intake housing. K&N intakes are designed to dramatically reduce intake restriction as they smooth and straighten air flow. This allows your vehicle's engine to inhale a larger amount of air than the OEM air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The filters on these kits are washable and reusable. Most of our intake kits are relatively easy to install using tools commonly available (see installation instructions). Some 77 Series Air Intakes are not legal for use in California and other states adopting California emission standards while others are CARB exempt and 50 state legal. Check the K&N catalog or website vehicle parts search for specific CARB status.

[More Information on 77 Series Air Intake Systems]
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Free-flowing aluminum tube
  • Replaces entire factory air intake system
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • Easy to install, usually in 90 minutes or less
  • Washable and reusable lifetime air filter
  • K&N Million Mile Limited Warranty®
Available Information
Installation Instruction Sheet
77-1540KP Vehicle Applications
Dyno Chart - 2005 Jeep Liberty 3.7L - 5.92HP Increase
News Story - 3/14/2006 -- Increase 2004, 2005, 2006 and 2007 Jeep Liberty Power by Almost 6HP with K&N Air Intake

Part 77-1540KP Product Specifications
Product Style: 77 Series Kits
Estimated Horsepower Gain: 5.92 HP @ 4054 RPM
Replacement Filter: RF-1048
Air Filter Color: Red
Air Filter Outlet Shape: Round
Street Legal In All US States: Yes
Air Filter Height: 6 in (152 mm)
TUV Approved (Europe): No
Air Filter Material: Cotton Gauze
Clamps Included: 6
Clamp Material: Stainless Steel
Clamp Style: Regular
Couplers Included: 3
Mass Air Flow Sensor Adapter Included: Mass Air Flow Sensor Adapter Included When Required
Intake Pipe Color / Finish: Polished
Intake Pipe Ports: All intake tube ports needed for the specified applications are included
Vacuum Tubing Included: Yes
Air Filter Large End Diameter: 7.5 in (191 mm)
Weight: 11.6 lb (5.2 kg)
Product Box Length: 22.25 in (565 mm)
Product Box Width: 14.25 in (362 mm)
Product Box Height: 12.5 in (318 mm)

Horsepower gains based on similar vehicle dynamometer test. Results will vary.

Customer Feedback      Be the first to review part 77-1540KP

Great results with the AirCharger on my 05 Jeep Liberty 3.7L 4x4

I recently purchased the K&N air charger (air intake) kit for my 2005 Jeep Liberty 3.7L 4x4.  I’m not an auto mechanic by any means, so the very detailed installation instructions were perfect as I had the kit installed within the 90 minute estimated install time.  After the install, I took it for a drive and instantly noticed the additional power and the transmission seemed to be shifting much more smoothly now.  A few days after that, I pulled my ATV from NC to WV through the mountains.  When pulling up the big hills, I could really feel the difference in that the engine didn’t seem to work as hard.  If the engine downshifted, there was more power than before.  I had been tracking my gas mileage prior to the install and after the install.  Consumer Reports rated my Jeep in their “real” test as having 10 city and 22 highway.  Before the install, I was getting about 15-16 on my normal drive (no highway).  Now, I am getting 17-18 mpg.  That doesn’t sound like much, but just that much difference can add up to almost 40 more miles per tank (20 gallon tank). That’s a savings of over 2 gallons of gas per tank at $3.00/gallon which is about $6.00 per fill up! So, not only did I gain the extra power, I save money at the pump!
Jeff, Cary, North Carolina
I love your products! I purchase mine for my Scion FR-S, and I can say this is the best simple performance upgrade I ever made! I feel the difference in power right away. I even purchased another one for my Jeep Liberty! Great product, thank you!
Anibal Babilonia, Frankfort, illinois
2011 Jeep Liberty Renegade 3.7L, 4x4, trail rated has a real world city driving increase of about 1.6 mpg on the uphill / downhill area driven. Haven't taken it out on the freeway for a long trip yet but if the city driving is any indication, I would expect highway mpg to possibly increase by about 3+ mpg. Jeep KKs & JKs do not get good mileage because of the non-aerodynamic (flat) front end, low gearing and extra weight from under chassis skid plates so this is a pleasant surprise. Low end acceleration has a felt increase, especially from a standing start on a 5% or more uphill grade, without sacrificing the increased mileage. Because of the increased engine performance, the transmission shifts faster into the next higher gear and holds the gear longer under load. I would buy another K&N air filter for any vehicle I own.
Joe, Washington