have just checked my seats and can feel no discernible difference where you note same - but I have 'comfort' rather than 'sport' seats and that may make the difference
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2013 650i Gran Coupe xdrive
Prior: 2010 550i GT xdrive | 2008 335i Convertible | 2007 335i Coupe | 2006 130i Hatch | 1998 540i Sedan
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