Just a friendly bump for Harold and these dampers. I have 5200's on my 135i currently. I put M3 camber links on the rear so I will be able to put them on my E90 M3 when it arrives. Likely am going to upgrade to the 5300's. The nice thing about the 5000 series is that they are modular and can be upgraded when desired.
This is the best combination for street comfort and track I have ever experienced. I love these things. So much so that I'm putting a set on my E30 M3 (4200's).
2011 E90 M3 - Alpine White/Fox Red Extended
Premium/Convenience/Cold Weather Package - Competition Package - M-DCT - Sunshades - EPS - BMW Apps - Sat Radio - Ipod/USB