What trouble are you guys talking about. All they have to do is bolt up a different differential. IT doesnt really entail anything outragous. You can swap a differential in 3hrs if you wanted to yourself. IT wouldnt cost BMW any more time to install a different differential in the first place. Its not like they put in one and then take it out and put in the other version. And the reason why they would do it is to save money. Maybe they make more of a profit because of it, who knows. Its always about money. But as far as this being a pain in the ass to do for BMW, it wouldnt be at all. In fact every US version Bimmer differs from euro spec in some way or other. The E36 M3 US spec had a different differential than the Euro spec M3. I know that for a fact. Ive heard this from many different sources about the X3 and X5 and allthough i dont know 100% for sure it is definately not the first time BMW has done this and wont be the last. Not sure why you would think this is so unbelievable. By the way its not that the US diffs cant handle hiting 130mph. Its that they cant handle sustained cruising for prolonged periods of time at 130mph.

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Dinan M3

2006 X5 4.4i Sport Current Vehicle
2006 CLS 55 AMG Current Vehicle
2010 FORD F-450 King Ranch Current Vehicle
2012 GL 550 Current Vehicle

1999 M3 Dinan S3 SOLD
2001 M3 Dinan S2 SOLD
2002 M5 SOLD
2004 X5 4.4i sport SOLD
2007 335 XI Lease ended
2009 E92 M3 SOLD