I asked my friend who works at the factory about that, when parked next to the Euro / rest of the world spec it looks like the 2 pipes is missing something with the gap at the bottom! He said it's something to do with US regulations which is a shame for those markets...
Huh, you'd think they could alter the exhaust to still maintain 3 tip, although knowing US regulation it probably has to do with a crash bar impeding the bottom tip?