Abstract: The engine induction system is a supplemental air filtration system for internal combustion engines. The system adds one or more supplemental air filter elements providing parallel flow with the original filter element, thus allowing air to flow through all filters simultaneously, rather than sequentially as in progressive filter systems. Thus, the system continues to allow air to flow into the induction system through other filters if a single filter becomes blocked. The system may have one or more supplemental filters connected to the primary filter plenum via appropriate ductwork, allowing the supplemental filters to be located in any practicable location as desired. Alternatively, one or more filters may be connected directly or remotely to the endplate of a cylindrical or conical filter element. The result is an increase in overall filtration area and a reduced pressure drop across the filters and corresponding increase in engine efficiency.