It is a great film either way. The controvery between whether it's dubbed with the film sped up on a Mercedes or an actual Ferrari is one of the great debates. People have pointed out places where the car sounds like it's accelerating but the vehicle is actually decelerating and other things in the film moving too quickly to support the Mercedes theory. Personally, I just enjoy the film for it's automotive and artistic value.
Another great one is Climb Dance:
[ame="http://www.youtube.com/watch?v=J-K1B4sTX4o&feature=related"]YouTube - Climb Dance (High Quality)[/ame]
Here is a cool link that mashes up the film with a google map.
I am not going to get into the whole what was driven thing as there has never been any definitive proof of what was used.....but count the number of shifts in some sequences and you can tell the audio was not recorded at the same time.
