If you read between the lines, there is some pretty good info on how well thier filters actually filter:
Quote:
• Air filters typically plug very slowly, and initial filter restriction may not occur until 50,000 miles or more depending on operating conditions. Diesel applications and off-road use will generally require more frequent cleanings or maintenance.
• Most applications will show no air filter restriction on the service indicator with a new K&N Air Filter. There may be rare instances where the position indicator could move in the window even with a new air filter. This could result from high air flow engine requirements, or from operating in high humidity or rain. Do not be alarmed if the clean air filter restriction exceeds the initial calibration of the service indicator. The air filter should not be cleaned until the yellow position indicator reaches the red zone.
• K&N Air filters become more efficient at stopping dirt as they build a dust film. It is recommended that the air filter be cleaned only when the air filter service indicator reaches the red zone.
The part in bold is really good.
JUst imagine how much crap your engine has ingested by the time the indicator reaches red.
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