The SRT Viper has not been selling very well with strong competition from the new Chevrolet Corvette and now with the recent introduction of the Charger and Challenger SRT Hellcat packing 707bhp from a supercharged 6.2-litre V8 with 650 lb-ft of torque, the Viper with its 640bhp and 600 lb-ft of torque clearly is not the most powerful car Chrysler has in its line-up.