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You have the same X1 s28i M Sport like me, so I think they mean "high speed tuning feature" is M Sport with bigger anti-sway bars, etc.
I have summer tires Pirelli P7, and like 38 front @ cold (60-90 deg), and 40 rear cold.
I'm written about the high speed instability several times, and put Burger 12mm front spacers which tightened up steering, and keeps the roll to a minimum under 130 mph which is fast enough for me.
You can put spacers in back also if you like and will probably make it even more stabile, but will understeer more or be harder to corner.
If you don't drive fast on curvy roads more spacers in back might be what you like, but try 12mm in front first.
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