My 14 X1 s28i M sport had some kind of horrendous sway when new.
Very easy steering, but when I tried to catch guys on the autobahn it would change lanes at 120 mph.
With M sport the car wasn't rolling since it had stiff suspension.
I noticed the front track was 1.1 inch shorter so I put 12mm spacers on front only and stooped that.
Now the tracks are approx the same, and steering is firmer, but precise.
I've got Michelin PS4S on and they ride like a dream.
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