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I think the stock X3MC brakes are outstanding for track work, given what exactly this vehicle is... a 4600+ lb SAV.
I took my 2021 out while instructing for the regional BMW group at VIR earlier this year. Other than a flush with SRF, the stock brakes performed flawlessly.
Sure, I wasn't braking as hard or as deep as I do in my 2018 Z06 Z07 with AP Racing brakes & slicks, but I was duly impressed & had no problems with fade or modulation after 20+ minute sessions on Full Course (140+ MPH braking zones on the front & back straights). Full is not as hard on the brakes as North or Grand Courses, but still works the brakes very hard.
EBC sent me a set of Yellow comopound front pads off the M5 or M7 (can't remember which) to try, but they are still in the box.
What track & config did you cook the OEM brakes on so quickly?
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