How much horsepower in a 2000 saleen mustang supercharge?

The horsepower of a 2000 Saleen Mustang with a supercharger varied depending on the specific Saleen model. Saleen offered several different packages for the Mustang that year, each with varying levels of supercharger modifications and resulting horsepower.

You won't find a single answer. To know the exact horsepower, you'd need to know the specific Saleen model (e.g., Saleen S281, Saleen Extreme, etc.) of the car in question. Even then, the actual horsepower might vary slightly due to individual build specifics. The best way to find out would be to check the car's original documentation or contact a Saleen specialist.