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I just did a search for replacement M3 rotors: $4500 each was the lowest I found.
There's an article in the latest Panorama (PCA magazine) by a Boxster owner with PCCB. Six track days and the wear indicators were showing. His lap times improved after switching to iron Probably not the result of brakes, but clearly the iron rotors didn't slow him down.
Make mine metal until the technology improves and the cost comes down.
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