Abstract: The present disclosure relates to improved systems and methods for providing a catalyst to an internal combustion engine. To this end, the systems and methods described herein may redirect a measured flow of pressurized air from an existing engine air flow through a catalyst reservoir to create a catalytic aerosol or mist. The aerosol or mist may be reinjected or delivered to the air intake of an engine. In various embodiments, the systems and methods disclosed herein utilize an existing engine air flow to produce a catalytic aerosol and/or mist rather than utilizing electric pumps or Venturi draws. Air flow may be controlled, adjusted, and/or optimized based upon an engine to which the disclosed systems are coupled based upon one or more passive flow control components (e.g., filters, restrictors, orifices, and/or valves).