-The 2016 Dodge Viper ACR is the fastest Viper around a racetrack—at least that’s what Dodge claims—but a 177-mph top speed makes it the slowest Viper. With the exception of a finned differential for cooling, the ACR’s drivetrain is identical to that found in the rest of the Viper lineup. That means an 8.4-liter V-10 that throbs out 645 horsepower and 600 lb-ft of torque and looks to be about the size of a steamer trunk. What makes the Viper ACR faster around a racetrack is also what reduces its straight-line speed—downforce. READ MORE ››
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