Clean air? Cold air? What is fact and what is myth? For one thing, it's air, and the density of air varies with both the weather and altitude. That means there is literally more air in the same amount of space when the weather is cool than when it's hot. So one way to get a performance boost is to only drive in cold weather. Since air is variable, air flow claims in absolute terms are not meaningful. This means we must move into the realm of comparison and/or averages.
K&N Take Air Filters Seriously - For over 30 years they've manufactured serious air filters completely unlike traditional disposable filters. Their air filter is designed to achieve high, virtually unrestricted air flow while maintaining filtration levels critical to ensure long engine life. The secret to our success lies in the unique characteristics of our filter medium that was originally developed by K&N all those years ago in the dust, sweat and tears of desert motocross racing. They just wanted to win races and stumbled on a cotton filtration technology destined to be great. Their high flow cotton gauze air filter is washable, reusable and built to last for the life of an engine. The filters consist of four to six sheets of cotton gauze layered between two sheets of aluminium wire mesh. This media is then pleated and oiled to enhance its filtering capabilities and overall performance. The result is an air filter that allows dramatically more air into an engine, is washable and reusable, and will protect your engine for the life of your vehicle.
2003 Hyundai Tuning Project

Visit our tech section for a new interesting Do-It-Yourself (DIY) document on our Hyundai Elantra 2003 tuning project.
 By Billy Red, Tuning Specialist
How often should I clean the filter?

The general rule of thumb is that the filter needs to be cleaned when the dirt build up gets as thick as the wire mesh. The usual interval is 30,000 - 50,000 miles depending on driving conditions. Always inspect your filter element whenever you change your oil.

Jean-Pierre Xenopoulos

Current ride: Honda Civic SI 2000
Favorite Car: Bugatti EB110
Ugliest Car of all times: Pontiac Aztek

More info >

Question: Will the use of an aftermarket filter void my factory warranty?
It is against the law for a manufacturer to require the use of a specific brand of air filter unless it provides a replacement air filter, free of charge, under the terms of the warranty. For a more thorough discussion of this law known as the Magnuson-Moss Warranty, see K&N's Vehicle Warranty Section. Also see their Letter Regarding Vehicle Warranty and K&N Replacement Filters. provides you with more quick answers to common questions.
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Jean-Pierre Xenopoulos & Jean-René Auger
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February 2005


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