I have the same decision to make for my 128I. Bilstein or Koni. I had years worth of experience with both on an E36. Neiter let me down, but the Bilstein were so much stiffer, so I switched to Koni's which could be "dialed in". I never had any fail, even though I tracked both. And the Koni+eibach+camber plates could really perform at the track and reeled in much higher horsepower cars in the corners. So I'm leaning toward Koni.
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