96-98 Mustangs with the 4.6 Liter have 215 Horsepower, the 99-04 Mustangs with the 4.6 Liter have 260 because of newer better flowing heads than the previous body configuration. If desired a 96-98 Mustang can be fitted with heads cams and intake off of a newer Mustang to net a higher HP rating and higher compression to gain a bit more.
The horsepower in the 1988 Ford Mustang 5.0 was 225 horsepower
The V6 - 2000 Ford Mustang is 190 horsepower
The 2000 Ford Mustang GT was rated at 260-horsepower
2001 Ford Mustang : GT , 260 horsepower Bulitt , 265 horsepower Cobra , 320 horsepower
The 1996 Ford Mustang GT was rated at 215 horsepower
The 2003 Ford Mustang was rated at 190-horsepower
The 1986 Ford Mustang 3.8 liter engine was rated at 120-horsepower
The 2001 Ford Mustang GT was rated at 260 horsepower
Ford rated the 1993 Mustang GT at 205 horsepower
The 1996 Ford Mustang GT was rated at 215 horsepower
141 horsepower
205 horsepower