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I'm too concerned with rocks getting caught between the caliper and wheel from the bigger brakes. Especially cause in winter here, the city covers our roads with gravel. I've seen a bunch of threads on the m3/m4 section of people's wheels getting destroyed and BMW won't replace them unless you have the wheel protection package. Otherwise, I would LOVE to have the CCB's. But brake ducting seems to do quite a good job for the stock brakes.
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