How much horsepower does a 2003 cummins diesel engine have?

The horsepower of a 2003 Cummins diesel engine varies significantly depending on the specific application (truck model, etc.). There wasn't a single horsepower rating for all 2003 Cummins engines. You'll need to specify the vehicle it was in (e.g., Dodge Ram 2500, Freightliner truck, etc.) to get a precise answer.