The average horsepower of the 2015 Dodge Challenger SRT® Hellcat is 707-hp, making it the most powerful muscle-car ever. This is because of its brand new Supercharged 6.2L HEMI® SRT Hellcat V8 engine.
The Supercharged 6.2L HEMI® SRT Hellcat V8 engine is the brand new Dodge engine that is specially fitted for the 2015 Dodge Challenger. The extremely powerful engine has a horsepower of 707-hp and a torque of 650 lb-ft. The new class-exclusive Challenger also features a TorqueFlite® eight-speed automatic transmission with paddle-shifters, which increases the car's precision, while offering an 11 percent fuel economy improvement. The manual version of the Challenger is still available with its standard TREMEC® six-speed manual transmission.