The rivalry between the Ford Mustang and Chevy Camaro hasn’t been this heated since the late ’60s. If you haven’t been following, the Mustang currently holds the horsepower advantage over the Camaro with its tire-shredding 550-hp 2011 Ford Mustang Shelby GT500 model. But the balance of power is about to shift, as details emerge about the upcoming 2012 Chevrolet Camaro ZL1.