I think Ford also had a Super Snake that was a Shelby version. If I remember, it was a Mustang that wasn't covered by warranty but was a Shelby custom job (You take your Mustang Shelby to their facilities and kiss your warranty goodbye).
800-HP 2012 Ford Shelby Super Snake: New York Auto Show Preview
That's it. I'm not sure where but on a track (and even then not so sure) you'd be able to use that much horsepower. Would be fun to take on the Autobahn though. Speaking of, I sure wish the U.S. had a version of the Autobahn here, or that our drivers would at least adopt some of the Autobahn rules, like if you're in the far left lane and someone gets behind you, you move over to the right lane, you know the common sense rules......