I assume that this is the 18" BMW performance brake kit. The calipers come in red, yellow and orange. The price varies depending on the color, saw them from $1700 and up plus installation. What I could not find out yet is whether the kit fits the X3 without modifications, I also did not find any comments describing the change in braking performance.
The challenge remains, even if they fit, that BMW is not officially recommending them for the X3.
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