As far as i know that US Vs. EU mode is not coded by software, but MK IV it self, it can be changed by dealer or navcoder, not navtweek
Check with Kiwi he should know for sure

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005