The all-new 2015 Dodge Challenger SRT, with its supercharged 6.2-liter HEMI® Hellcat engine, produces an unprecedented 707 horsepower and 650 lb.-ft. of torque, making it the most powerful Challenger ever, Dodge's most powerful V8 ever and the most powerful muscle car ever.The Challenger's new 6.2-liter Supercharged Hellcat engine is also...