I'm looking at these MSS springs currently. My problem is I am ridiculously happy with the ride quality of my car right now since I took off the run flats. I also need ground clearance and 4WD as I live in the country and the roads/lanes are pretty bad.
However, I keep thinking that there is a little bit of arch gap that could be gotten rid of and a bit too much pitch and squat on acceleration & braking.
I think these springs set to -10mm front and -5mm rear would do the trick. I don't know what the spring rate is. Ideally they would be 10% stiffer at a mild drop for me to want to buy them but this is a secret according to the website.
Worst case I leave the OEM springs and dampers alone. I have M5 roll bars and camber arms to set the car up with a bit more corner grip and roll resistance, which in theory would make the car handle well on the roads I drive, without making it uncomfortable (I bought the M550i over an M5 for a reason!)
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