I've ripped this from the DVD myself as well. Ever wonder where Seth MacFarlane got a copy of this theme so clean that he was able to use it as the intro of one episode of "American Dad"?
Same old , its who you know not what you know :)
I haven't seen American Dad, but there is a crisp and clear version of this song on the CD Bombay The Hard Way. Excellent album. That's probably where Seth McFarlane got it. It's slightly remixed, but sounds almost exactly the same.