I had 10mm front 12mm rear on my 135i and I found it improved the handling quite substantially. No need to get Burger, there's a mob called Caold technology in Clayton Vic, which engineers them, I've had three sets of hub centric ones for them and they have all been spot on. You can buy them on ebay, and if they don't list them you just message them and the will custom make the size you need.
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