Several aftermarket manufacturers sell engine air filters that they claim provide better airflow and increase horsepower and acceleration as a result. Some of these companies have many loyal customers who swear that they have benefited, particularly in performance, from using these high-flow filters.
These filters are often made of cotton or nanofibers, and some can be cleaned and lubricated with a special oil and then reused, with at least one brand guaranteeing they will last a million miles. Others can be cleaned with an air hose and reused. Many are designed to directly replace the stock paper air filters provided by the vehicle manufacturers; others are included in a freer-flowing air intake system that delivers more fresh air to the engine.
On the surface, these claims make sense. Engines are like athletes in that the better they can breathe, the faster they can go.
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