Air Filter Technology, How Engine's Work, and Automotive Performance

Chapter 5 - The Worlds Best Air Filter Comes in RED and from California


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It is very easy to build a filter that has a "K&N look" even if the materials used are completely different. It has gone on for years and we cringe every time we see a counterfeit that is of low quality. When comparing air filters, you must consider the efficiency, capacity and airflow values and you must know how they were measured.
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Air Filter Technology, How Engine's Work, and Automotive PerformanceBy K&N Engineering, Inc.