How much horse power a 5.9 cummins have?

You need to be more specific! The 5.9 Cummins engine has been produced in many different variations over the years, each with different horsepower ratings.

To tell you the horsepower of a 5.9 Cummins, you need to tell me:

* The year of the engine: Horsepower ratings changed significantly over the years.

* The application: Was it used in a truck, a bus, a boat, or something else? Different applications often had different power outputs.

* Any modifications: Has the engine been modified or tuned to increase horsepower?

Once you provide this information, I can tell you the approximate horsepower of the 5.9 Cummins engine you're interested in.