K&N users would probably be surprised by the amount of air filtration testing and scientific research that goes on in K&N facilities as well as in independent laboratories. As the leader and originator of the high flow performance air filter we are always looking for new ways to provide excellent protection and maximum power for your car, truck, motorcycle, and just about anything else with an engine. In 2005 more than 1600 vehicles were tested by K&N's R&D group on dynamometers in the US, United Kingdom, and the Netherlands. In addition to these power and torque tests, we also performed more than 110 filtration tests and more than 1,200 air flow tests with our in-house state-of-the-art test equipment. Select one of the links below to read or listen to more information on air filters and the science behind their design and function.

Letter from K&N Regarding U.S. Vehicle Warranty and K&N Replacement Filters

Audio Book for K&N Dealers - These audio files were created for K&N dealers as a training tool. Some of the information, chapter 13 for example, applies only to dealers but other chapters contain information that many will find educational. Below are links to each audio book chapter in MP3 format.

Chapter 1 - What Do I Have Under My Hood and Why Should I Care?
Chapter 2 - An Air Filter That Mattered
Chapter 3 - A Reusable Idea in a Disposable Industry
Chapter 4 - If You Want It Done Right, Do It Yourself
Chapter 5 - The World's Best Air Filter Comes in Red and from California
Chapter 6 - A Natural & Remarkable Filtration Approach
Chapter 7 - Cotton is More Complicated Than You'd Think
Chapter 8 - Cleaning Your K&N Air Filter
Chapter 9 - The World's First Million Mile Warranty
Chapter 10 - Consumer Protection Pledge
Chapter 11 - Vehicle Warranties
Chapter 12 - Finding The Right Part For Your Vehicle
Chapter 13 - How K&N Air Filters Can Increase Horsepower
Chapter 14 - Air Filter Product Lines
Chapter 15 - K&N Intake Kits - The Ultimate in Horsepower
Chapter 16 - Intake Kit Product Lines
Chapter 17 - Commercial Grade Reusable Diesel Air Filters
Chapter 18 - Mileage
Chapter 19 - How Your Engine Works, Airflow, and Horsepower

Text Version of all 19 Chapters

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	K&N Technical Learning Center Engine Air Filtration Facts & Technical Information