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K&N 77-2581KP 4.8 out of 5 stars 9 Customer Reviews
Intake Kits > Performance Intake Kit

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The K&N 77-2581KP high-flow performance air intake system is a free-flowing, mandrel-bent aluminum tube air induction system designed to fit some Ford F150 models. The restrictive factory air filter and air intake housing on your vehicle are replaced by this K&N air intake system which is designed to dramatically reduce air flow restriction as it smoothes and straightens air flow. The improved air flow allows your engine to inhale a larger amount of air than it would from the stock air intake. More air means more usable power and acceleration throughout your engine’s RPM range. The 77-2581KP air intake comes with a chrome topped K&N high-flow air filter and a heat shield that installs onto the lower airbox. Air is directed through the intake tube into the engine’s throttle body for a guaranteed power gain. The intake tube has an attractive chrome-like finish that's made to last and it accommodates the factory mass air sensor and replacement crank case vent and EVAP check valve hoses. The oversized cone shaped air filter can be used for up to 100,000 miles before servicing is needed depending on driving conditions. This air intake is relatively easy to install usually in 90 minutes or less using existing factory mounting points. The tools needed are a screwdriver, T-20 Torx driver and several wrenches. Some K&N 77 series air intakes are not legal for sale or 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 for vehicle applications and specific CARB status for each vehicle and air intake.

[More Information on K&N 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

Product Specifications

Estimated Horsepower Gain9.95 HP @ 5508 RPM
Air Filter ColorRed
Air Filter Height6 in (152 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
California RestrictedNot legal for sale or use in California
Clamp MaterialStainless Steel
Clamp StyleRegular
Clamps Included5
Couplers Included1
Intake Pipe Color / FinishPolished
Intake Pipe PortsAll intake tube ports needed for the specified applications are included
Mass Air Flow Sensor Adapter IncludedMass Air Flow Sensor Adapter Included When Required
Product Box Height10.5 in (267 mm)
Product Box Length35.5 in (902 mm)
Product Box Width13.25 in (337 mm)
Product Style77 Series Kits
Replacement FilterRC-5173
Street Legal In All US States No
TUV Approved (Europe)No
Vacuum Tubing IncludedNo
Weight12.1 lb (5.5 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

Product Reviews

  What a great product! Easy to install and noticed immediate improved throttle response and deep throaty sound in my 2014 F150 5.0 Coyote! Haven't noticed much gas savings but performance was improved and that's what I was looking for.
Nathan Forti Dallas, Texas
  I immediately noticed a more meaty sound to the engine as well as an increase in power. I'm retired and have had my F150 for 20 months and only have 13,000 miles on it so I don't drive a lot. I've only had the intake on a couple of weeks and love it. I reset my gas mileage upon installation and actually at this point have lost 1 mile per gallon. Anticipated gaining gas mileage. Perhaps that will happen in time since all my driving has been in town! Time will tell, I hope.
Gary Florida
  Great part and easy to install.
Robert Stolt South Carolina
  I love the throaty tone when I get on the throttle. Seems to be noticeably quicker. The nicest thing is at cruising speed it's as quiet as stock.
Steven Suda California
  Easy to install after you get the tight rubber hoses on... All that means is that they wont come off!!! Great sound and performance is felt right away. Unfortunately no gas savings yet (my own fault) because I can't seem to stop hitting the peddle to the metal... Great kit and great overall piece.
Ty Tucson, Arizona
  Great product, just getting it broke in. I can already feel the throttle response and low end torque. Interested to see how the MPG will increase, if by just a little as gas prices continue to rise.
Craig Lustek Ohio
  I am very pleased and satisfied with the boost of horsepower and improved mileage!
Emre Goksu Seneca Falls, New York