425-hp, 6.1-liter V-8 (premium),High-performance SRT8 version,SRT8 , The SRT8 is a high-performance version of the Dodge Challenger, visually distinguished by its black hood racing stripes and exclusive leather sport seats with embroidered SRT8 logos and striped inserts. , , The SRT8 is powered by a 425-hp, 6.1-liter V-8 engine that makes 420 pounds-feet of torque with either a five-speed automatic or an optional six-speed manual transmission. It also sports Brembo brakes and a sport-tuned suspension and steering. , , Other features include: , Limited-slip differential , Reconfigurable display can show zero-to-60 mph times, eighth- and quarter-mile times, braking performance and g-force readings , Standard 20-inch aluminum wheels , Limited edition Plum Crazy Model includes Plum Crazy Pearl Coat exterior color, plum seat-stripe insert and serialized plaque on the dash .