Quote:
Originally Posted by auggiem3
Saw that and I wonder if BMW is reading the forum. If you look at the screen shot attached, they are clearly testing with a different back wheel - hopefully wider to accommodate a fatter rear tire (at least 305's) tucked under a more exaggerated fender flare/trim...
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Based on your observation they could also be testing an active rear diff. The x4 m40i has an optional M diff but my guess is that it's mechanical vs electronic. I would suspect an active diff on an ///M variant to be included and tested with various rear wheel configurations.