in this site http://autos.yahoo.com/bmw_6_series_650i_convertible-specs/?p=all
it says and i quote...

"Weight Distribution AT (Front)
49
Weight Distribution AT (Rear)
51
Weight Distribution MT (Front)
49
Weight Distribution MT (Rear)
51"

meaning it is heavier in the rear is this a typo or is bmw tunning their car differently ...?