Inthe high-stakes world of performance cars, horsepower is king. It's the first stat bragged about by owners trying to explain why their CamaroChallenger or Mustang is better than their foes', and it's the headline figure promoted by the automakers themselves year after year.

When Ford announced that the 2013 Shelby GT500 would be punishing the pavement with 650 horses, the world stood up and took notice. Remember, though, these were just estimated figures, as the car had not yet been SAE certified. If reports from the Team Shelby message board prove accurate, the 2013 GT500 has finally gotten its official figures.

How's about 662 horsepower and 630 631 pound-feet of torque?

Yep, that'll do. It's notable that these figures represent increases of 12 horsepower and 30 21 lb-ft over the earlier estimates, and they also put even more distance between Ford's top-performing Mustang and Chevy's 580-horsepower Camaro ZL1. It also means the Shelby lays down considerably more ponies that the Corvette ZR1 and its 638 horsepower and 604 lb-ft.

Now, will we see a corresponding horsepower-addled response from Chrysler or General Motors? Only time will tell.

*UPDATE: We've received an official press release from Ford quoting power figures of 662 horsepower and 631 pound-feet of torque, making the 2013 Ford Shelby GT500's engine the most powerful production V8 in the world. Ford is also keen to point out that the 2013 GT500 is one mpg more fuel efficient, both city and highway, than the 2012 model and five mpg better than the Camaro ZL1. Scroll down for the complete press release.