horsepower for 2014 mustang gt
420 hp, here is link with more production info: http://en.wikipedia.org/wiki/Ford_Mustang#Fifth_generation_.282005.E2.80.932014.29
Well the 5.0 V8 with a manual would make 420hp and around 400-405 to the wheels but with a automatic your making about 400 and around 380-385 to the wheels, automatics always lose you power and the fun factor.
You are thinking of the 2014 Camaro...there was a difference in HP with manual and auto. The 2014 Mustang GT there is no difference..they both make 420HP