Some new pictures recently released, the car will be available for download this summer. forzamotorsport.net Some highlights of the 2013 SRT Viper: â¢Street and Racing Technology (SRT®) brand's flagship performance machine returns with more power and performance, superior craftsmanship, new technologies and creature comforts â¢Two new models include SRT® Viper and SRT Viper GTS â¢All-aluminum, mid-engine 8.4-liter V-10 delivers an estimated 640 horsepower and 600 lb.-ft. of torque -- the most torque of any naturally aspirated sports car engine in the world â¢Chassis enhancements bring 50 percent improvement in torsional stiffness â¢Triple-digit weight reduction results in Viper's best power-to-weight ratio â¢Standard safety features include electronic multistage stability control, traction control and new 4-channel anti-lock brake system (ABS) â¢All-new, innovative interior designs set new standards with premium materials, new technologies and unmatched craftsmanshi! p â¢All-new carbon-fiber and aluminum skin is sculpted for high-speed stability and a slippery .364 drag coefficient (Cd) â¢Timeless exterior design incorporates iconic Viper styling cues with a contemporary execution