Pre-filters: Fact vs Fiction

True or False: The purpose of a pre-filters is to act as a dust screen.

Answer: False. Pre-filters are designed to keep large debris, such as mud clots out of your air filter. The openings on a pre-filter are much larger than the ones in your air filter, so it is the filter itself that protects your engine from dust. It is important to examine track conditions when deciding whether you will use a pre-filter as it can add a small level of restriction and reduce torque.