Abstract: An engine exhaust system for an internal combustion engine including a water-filled scrubber tank, a combustion gas diffuser tube disposed in the scrubber tank below a predetermined water level, a moisture trap attached to a gas outlet from the scrubber tank, and an activated charcoal filter disposed to receive the gases emitted from the moisture trap. A return line provides fluid communication between the moisture trap and the intake manifold of the engine to recycle moisture laden gases to increase engine performance and horsepower while minimizing harmful noise and chemical emissions.