2013 Shelby GT500 gets 662 HP - beats Viper & Vette

Are you kidding? The ford will keep up with the viper....if it ever hooks up. "Power without control is nothing" as my uncle used to say. And the Shelbys have never had control when it comes to putting the power down, except for the lower powered ones. And I'm pretty sure that the 2 keys are specific to the Boss 302 and 302 Laguna Seca editions of the mustang.

My son has a 2011 GT500 and it hooks up just fine. They got some good tires on them that grip well. His is rated at 550 HP and will do 0 - 60 in 3.7 seconds.

I've heard of the two key thing. I think that is for valet parking so they don't get too carried away when parking it for you. I'm not sure what models have that.