CARS2015 Dodge ViperThe 2015 Dodge Viper SRT at Willow Springs Raceway, Rosamond, Calif.Richard Prince, ChryslerLow, wide and fast, the 2015 Dodge Viper will have a starting price $15,000 less, and 2014s on dealer lots get the same price cut.DodgeThe 2015 Dodge Viper SRT GTS shows off at the Sonoma, Calif., race track.Richard Prince/ChryslerThe 2015 Dodge Viper gets a horsepower boost, to 645 hp from the 8.4-liter V-10.Richard Prince/ChryslerThe 2015 Dodge Viper gets a mileage-rating boost to as much as 20 mpg, in addition to a lower price and more-powerful engine.Richard Prince/rprincephoto.comA Viper in Competition Blue, new to the 2014 SRT ViperScott Olson Getty ImagesA woman checks out the 2015 SRT Viper at the North American International Auto ShowScott Olson Getty Images2014 SRT Viper in Stryker Green.Chrysler ChryslerFeatured Weekly Ad