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K&N 63-2581 4.9 out of 5 stars 17 Customer Reviews
63 Series Aircharger Kits > Performance Intake Kit

 List Price: $484.92
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The K&N AirCharger 63-2581 air intake system replaces 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 factory air filter assembly. More air means more usable power and acceleration throughout the engine’s RPM range. The 63-2581 air intake comes with a chrome topped K&N high-flow air filter inside a heat shield that mounts to the lower air box. The position of the air filter inside the heat shield helps direct cooler, denser air into the custom molded intake for a guaranteed power gain. The oversized 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 requiring only a screwdriver and several wrenches. This air intake cannot be sold in California. It is not legal for use in California or other states adopting California emission standards.

[More Information on AirCharger Air Intakes]
  • Guaranteed horsepower gain
  • Designed to improve throttle response and engine sound
  • Free-flowing high density polyethylene tube
  • Replaces entire factory air intake system
  • 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
Available Information
Installation Instruction Sheet
63-2581 Vehicle Applications
Dyno Chart - 2011 Ford F150 5.0L - 12.05HP Increase
Video Installation Video
News Story - 2011 and 2012 Ford F-150 Pickup with 5.0L Engine Gets Power from K&N Air Intake

Part 63-2581 Product Specifications
Product Style: 63 Series Aircharger Kits
Estimated Horsepower Gain: 12.05 HP @ 5304 RPM
Replacement Filter: RC-5173
Air Filter Color: Red
Air Filter Outlet Shape: Round
Street Legal In All US States: No
Air Filter Height: 6 in (152 mm)
TUV Approved (Europe): No
Air Filter Material: Cotton Gauze
Clamps Included: 5
Clamp Material: Steel
Clamp Style: Regular
Couplers Included: 2
Mass Air Flow Sensor Adapter Included: Mass Air Flow Sensor Adapter Included When Required
Intake Pipe Color / Finish: Black
Intake Pipe Ports: All intake tube ports needed for the specified applications are included
Vacuum Tubing Included: No
California Restricted: Not legal for sale or use in California
Weight: 10.6 lb (4.8 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.

Product Reviews    See all reviews!  Review part 63-2581

 I had a regular KN air filter in my truck but did not notice a significant inprovement. I installed the cold air intake kit from K&N and what an inprovement. Sound wise, I was really inpressed with the motor noise, but most importantly, the improved milage vs just the regular air filter is impressive. I am getting almost three miles per gallon more now than before withthe cold air intake kit. Sound, performance and milage which has increased, makes me a very happy customer.
Rick Counts, Fort Myers, Florida
 Doesn't take long to install. The pictures on the instructions are not that great, but easy enough to figure out. Once complete, I immediately noticed a throatier sound on acceleration and improved gas mileage. Great product.
Pete Stachowicz, Hilo, Hawaii
 Product preformed as advertised and expected.
Shon Sergent, London, Kentucky