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Having replaced three sets of rear pads and one set of fronts, with one set of front rotors, I cannot locate any other than stock rotors for front or rear.
Porterfield is making the low dust pads, but they will not be track suitable. The stock pads are.
Bmw will likely recommend replacing the rotors. My rears have lasted through multiple track days and several pad changes. They are very scalloped however. The BMW rotors are very good, and not that expensive. Replacement is not that difficult except for the electronic parking brake, which is a pain.
Shawn
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