I won't be convinced that it's "binning" until someone from BWM manufacturing posts to confirm. Sorry, but identifying the differences through part numbers and tuner speculation is incredibly difficult. You'd have to tear down and analyze the two engines from production runs in the same time span, and you'd have to critically analyze every single component until you found the difference. That's unlikely, to say the least.
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His: 2019 R1250GS - Black
Hers: 2013 X3 28i - N20 Mineral Silver / Sand Beige / Premium, Tech
Past: 2013 ///M3 - Interlagos Blue Black M-DCT
Past: 2010 135i - TiAg Coral Red 6MT ///M-Sport
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