Both companies are offering new iterations of their 1960s pony cars for example, the recently unveiled 2013 FordMustangShelby GT500 (650 horsepower) and the Chevrolet Camaro ZL1 ("barely street legal, " claims Chevrolet).
The FordMustangShelby GT 500 is the most muscular of American muscle cars, with a 5.8 liter V8 plus huge supercharger putting out 662-horsepower for a top speed north of 200MPH.