Jay Leno reviews the latest 2013 Ford Mustang Boss 302 and he seems pretty impressed. The 2013 Ford Mustang Boss 302 he tested is develops 444 hp and 380 lb.-ft. of torque. Apparently, Mr. Leno would rather have the new Mustang Boss (2013), than the much more powerful Shelby GT500. The 2013 Shelby GT500 is powered by a monster 5.8-liter V8 which spits out 650 hp and 600 lb.-ft. of torque.