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I just went with Bilstein B4 Sports paired with my M-Sport springs (stock on 135i) and I couldn't be any happier. Rides like what I remember it when it was new... Those of you who are thinking of refreshing the dampers for a daily driver, I'd encourage you to consider the B4's. I do not believe that they get enough love here.
I truly believe that the B6 & B8's would be too rough for daily driver duty... and throw in the confusion of what springs to pair them with!
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