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I got rid of my Bilstein PSS (B14) on my 135. They were very bad in all aspects. Unfortunately, my bad experience is not unique with those PSS, several friends had similar issues on other cars. I even had the Bilstein redone by an authorized specialist form Bilstein (to modify the dampening based on the weight of my car, etc...), and even then I was 2sec faster per lap with the KW V3. Anyway, the Bilstein finally had several quality issues, including noise and rapid wear at a point never seen before on other shock absorbers. I now have been a very happy customer of KW for years, and tested a lot of them (V1, v2, v3, CS, and now the new AST which are of the same dampening quality but at a cheaper price).
Note that my comments apply only to B14 and B16, I don't know the others.
Cheers
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2018 M550i Sepia-Violet
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