Originally Posted by Denk
I've experimented with a few spring setups on all of my M3's. I've found nothing to top the stock suspension on the road. It's beautifully dialed in by the M Division.
The power on grip and high speed composure over the rough stuff is where I see it shine over any spring setup I've had, including the Dinan. As far as appearance, I think stock looks fine in person, like a proper GT.
After going to a several thousand dollar street oriented coilover setup I definitely have an appreciation for just how well BMW has done with the OEM suspension on these cars. There is definitely better out there, but they have a IMO marginal improvement over stock, except for aesthetics.