According to autos.aol.com there is no difference in what was provided in the M Sport package.. It just cost more in 2011.
The Sport button controls your adaptive suspension and that is it. No transmission or engine mods.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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