Motor Trend's compares nearly every combination of modern American muscle cars on the market. Now it's time for the ultimate showdown - Hennessey's Camaro HPE650 vs Shelby's GT500 Super Snake vs SpeedFactory's Challenger SRT8. They head to the dyno, the test track, and the racetrack to determine which of these will win the battle. - The Ultimate Blog for American Muscle Cars and Muscle Vehicles