With an all-electric drivetrain comprising an electric motor, a Lithium-ion battery and a controller to manage it all, the Viper-inspired Circuit EV's bark is more of a hum. Its bite, though, is considerable. According to Chrysler, the two-seater's 268-horsepower energy supply is capable of launching the car to 60 mph in the sub-five-second range and to a quarter-mile time in the 13-second range -- figures comparable to those of Dodge's HEMI-powered Challenger SRT-8. The Circuit EV, of course, emits zero emissions in the process. Another product of Chrysler's ENVI advanced propulsion division, the concept also boasts a proposed driving range of 150 to 200 miles and can be recharged via 110-volt household outlet. We'll count it as another step forward.