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John Hennessey took his personal 2015 HPE700 Supercharged Ford Mustang to the Continental Tire Proving Grounds in Texas to see just how fast the muscle car would go. It managed 195.4 miles per hour when it hit the limiter going down the straight.

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Thanks to the 2015 Dodge Challenger SRT Hellcat there is a new magic number in the muscle car world – 707. To raise eyebrows these days in the power war, a vehicle needs to match or preferably exceed that palindromic figure. The tuners over at Hennessey took a look at it for their 2015 HPE700 Mustang and decided to go one better. Well, ten actually, because they bestowed their latest creation with 717 horsepower and 632 pound-feet of torque.