US automakers battle for horsepower in 2015 pony cars
Ford Mustang offers three engines from a 3.7L V6 to a 5.0L V8 delivering up to 435 hp and 400 lb ft. The EcoBoost 2.3L adds 310 hp. Camaro tops V8 options with 426 hp in LS3 and up to 580 hp with the LS7. Challenger ranges 305 to 485 hp, with Dodge promising a 707 hp Hellcat.