I had not realized that the 2TB option included the ability to modify the steering. Good to know. My information on the suspension agrees with most here, though: to alter the suspension you need the DHP.
I drove a 550i with DHP last week. I could notice differences in handling among the settings, though not huge differences, but hardly any difference in ride quality. I specifically sought out an awful stretch of pavement, and the car seemed to handle the worst bits the same, and fairly well, in every setting.
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