The horsepower of a 1992 Ford Mustang varied greatly depending on the engine option. There wasn't a single horsepower figure. You'd need to know the specific engine to determine the horsepower. For example:
* 2.3L 4-cylinder: Around 105 hp
* 5.0L V8: Around 225 hp (though some variations might be slightly different)
So, without knowing the engine size, it's impossible to give a definitive answer.