America's two newest and at the same time, most powerful series-production muscle cars are the 2013 Ford Mustang-based Shelby GT500 and the 2013 Chevrolet Camaro ZL1.
On paper, the $54,995 Camaro ZL1's 6.2-liter supercharged V8 produces 580hp at 6,000 rpm and 556 lb.-ft. of torque (754 Nm) at 4,200 rpm, while the $54,200 Shelby GT500's 5.8-liter supercharged V8 delivers 662hp at 6,250 rpm and 631 lb.-ft. (856Nm) of torque at 4,000 rpm.
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