How much horsepower does a high output 5.0 liter V8 have with factory headers?

The horsepower of a high-output 5.0L V8 with factory headers varies significantly depending on the manufacturer and the specific model year. There's no single answer. Ford's Coyote 5.0L engine, for example, has seen different horsepower ratings across its various iterations. You'll need to specify the *make* and *model* of the vehicle to get an accurate answer.