The 2004 Ford Mustang GT , 4.6 liter V8 is rated at :
( 260 horsepower from the factory )
412 hp
The 2006 Ford Mustang GT has ( 300 horsepower ) from the factory
265 stock
260 horsepower
260 horsepower
260 horsepower
a 4.6 ltr
300 horsepower
For a 2008 Ford Mustang GT : I believe that is rated at ( 300 horsepower from the factory )
240 hp
215 hp
319 hp at the flywheel.