Abstract: A system for cross turbocharging an engine is disclosed. The system includes a left bank turbine located in close proximity to a left bank of cylinders. The left bank turbine receives exhaust gas from the exhaust ports of each left bank cylinder. This exhaust gas is used to drive the left bank turbine which powers a right bank compressor. The right bank compressor is located in close proximity to a right bank of cylinders and introduces compressed air into the intake ports of each right bank cylinder to turbocharge the right bank of cylinders. In this configuration, the turbine and compressor are separated from each other with the turbine driving the compressor via a connecting shaft that passes across the engine. An analogous configuration involving a right bank turbine and left bank compressor is used to turbocharge the left bank of cylinders. An electric motor can be placed between each turbine and its associated compressor to provide an initial source of supercharging when the engine is first started.