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K&N Engineering - The World's Best Cotton Air Filter K&N Cotton Air Filter Products
High Performance Cotton Air Filters, Oil Filters & Air Intake Kits for your car, truck, SUV, motorcycle, and more!  
The #1 Reusable Cotton Air Filter in the World!
Invented by K&N more than 40 years ago.

At K&N, our high-flow cotton air filters are made of four to six layers of cotton gauze sandwiched between two epoxy-coated aluminum wire screens. The cotton is treated with a special grade of K&N oil causing tackiness throughout the cotton's microscopic strands. The nature of the cotton allows high volumes of air to pass through the filter, and when combined with the tackiness of the oil creates a powerful filtering media that ensures engine protection.
Cotton Air Filter Fibers
Cotton Air Filter Fibers

  K&N FilterCharger® Replacement Air Filters

  • Replacement Cotton Media Air Filters for most cars, trucks, motorcycles, ATV's, and more!
  • Designed to increase horsepower and acceleration
  • Washable and reusable
  • Will NOT void US vehicle warranty
  • Million mile limited warranty 
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K&N Replacement Cotton Air Filters

  K&N High Performance Intake Kits

  • Fuel Injection Performance Kits - FIPK®, Typhoon, 77 Series, AirCharger® and 57i air intake kits
  • Replaces restrictive factory air filter and air intake system
  • Designed to increase horsepower and acceleration by as much as 10% 
  • Works with original equipment computer and emission control systems
  • All air intake kits come with a genuine K&N high-flow cotton air filter
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K&N Performace Air Intakes

  K&N Performance Gold® Oil Filters

  • Wrench nut for quick and easy removal 
  • Meets or exceeds engine filtration requirements
  • Heavy duty construction with increased wall thickness for higher burst strength
  • High oil flow rate
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K&N Performance Gold Oil Filters


Over 800 different replacement cotton media air filters
for virtually every vehicle on the road.


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