Injecting hydrogen and oxygen gases directly into the vehicle’s engine through the air-intake manifold increases the engine’s combustion efficiency rating. This causes a near complete burn of the fossil fuels being used. The system focuses “precisely where the emissions are actually first created”, in the combustion cylinders.
The hydrogen and oxygen gases act as a catalyst that increases the flame speed from top dead center of the spark in an SI engine, or a faster explosive point in a CI engine. The ECM adjusts the fuel injector's duty cycle to send less fuel to the engine, resulting in a significant decrease in emissions.