I was wondering the same thing. I saw a picture of an E46 M3 with the M performance brakes, without this bracket. It looked so good! So I came to the 1-series forum to investigate, as they're standard on the 135i. I did not like the look of the performance brakes with this nub. Would be great to see more pictures of setups like this!
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E92 330i N52K 200kW (EU)
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