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Originally Posted by atr_hugo
What I remember - it's been a few years since I had them on the car - is that they do roll and pitch less than the stock dampers. I just don't know how they'll work on the '13 - the '08 had progressive rate springs on the sport suspension, IIRC, and I don't think it was a low as the '13's M Sport suspension. But then again, I've been know to be wrong (just ask She Who Must Be Obeyed).
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I've never seen a progressive rate spring for 1 series cars. It seems the "L2" and "L3" coded spring is what's know as the "Linear" spring that was supposed to come out in the later cars. Back to 2006, the 1 series hatchback used springs coded as "D0" or "D1" for the M-sport spec model, which seems to be part of the same numbering system used on the 3 series cars.
The way I look at it, all the E82 and E90 suspension systems actually have progressive spring rates. They use a long polyurethane bump stop that engages a short distance into the bump travel. When combined with the linear springs it provides a overall progressive rate.