Are the stiffer springs OK on our roads, or they make the ride a little harsh?I much prefer the 8/6k rates. Having driven both, I could never get the shocks at a setting I felt worked well with the softer springs. It always felt as if it was under damped but actually the spring was simply too soft. I would definitely recommend people use the stiffer spring rates for the heavy m5.
Where did you purchase them from?