Ford Focus RS 500 on the test track – Click above to watch video after the jump

On March 31 we're going to find out about a thing called the Ford Focus RS 500. The Blue Oval has posted a video of the even-more-hotted-up Focus doing a twilight round of its European test track in Lommel, Belgium. And it sounds rather... fierce. We're trying to figure out exactly what the 500 stands for: Units? Horsepower (don't be silly!)? Something else?

While we stew, you can follow the jump and listen to the sound of it in the video. And if any of you know what's coming, feel free to let us know in the comments.

[Source: Focus RS 500]