What tires are you using? If you don't need powerful cornering it was a huge difference when we used 235/65/17 on my wife's e53. Vs. The 255/55/18 we usually had. Type of tire also matters since run on flats often have a stiffer sidewall making for stiffer ride.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)