Based on my experience, ride comfort is not just a function of spring rates, but also the damping curve. I've driven my E92 M3 without rear shocks (it has KW Competition with 1,000 pound/inch rear springs), and the rear axle was surprizingly smooth over large road imperfections.
The beauty of the Clubsport 3-way is that it allows the user to tune down the high speed damping circuit, and this will make a big difference in ride comfort/compliance.
For those in Texas, this weekend we will have an M3 with Clubsport 3-way at Houston M Club's open track event.
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