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An air filter's efficiency actually increases over time, up to a point. The reason efficiency goes up is because the "pores" in the media where...
Your post doesn't make sense. Your reasons why you choose to not use a K&N in your Prius vs. your other cars don't sound anything like what other...
Air filter efficiency is determined by testing using ISO 5011 test protocol. This is the standard test used by filter manufacturers to determine...
There are no "inherent dangers" of using a K&N air filter. The purpose of an air filter is to filter dirt, dust, and other contaminants from the...