So yesterday the 25,2/22,2mm front & 15mm rear M135i/M235i anti-roll bars had been successfully installed- seems first in the World experience on N20.
Difference in the shape turned out to be for the coolant tubes clearance only. The N55 front ARB simply needs more space for the peripherial engine parts.
By now I need some 200-300km highway load to make the springs return to their nominal compression after the car was hanging overnight. But anyway, the change in roll control is really dramatical.
Overall mechanical grip is increased.
Also the rear suspension starts to work much faster after the steering inputs.
Overall turning balance seems unchanged even with no additional rebound adjustments to the Koni Sports (being set on 200 degrees front & 180 degrees rear with stock ARBs). Will wait for the springs to settle back completely and wach how it all will behave.
Will try to get out of the city tonight to have some highway run for some detailed update.