Whether you’re on a racecourse , an open highway or in urban traffic , piloting a Viper is a memorable experience. Brute force is its theme, and civilized behavior is nowhere to be found. A brawny 8.0-liter V-10 engine beneath the Viper’s hood puts out 45 hp and 490 pounds-feet of torque – the kind of torque that seems eager to drag tree stumps out of the ground. The engine is still the largest , most powerful engine offered in an American production automobile. A six-speed-manual gearbox is the only available transmission.