How much horsepower does a 2003 ford mustang gt have Source Source Source Source Source Source Source Source Source Source Read Also: 2003 Ford mustang gt horsepower 2003 Ford mustang cobra horsepower 2003 Ford mustang gt stock horsepower 2003 Ford mustang v6 horsepower 2003 Ford svt cobra horsepower 2003 Ford mustang cobra svt horsepower