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While it took several months of track-induced stress, our MMC rotors eventually cracked. That's too bad.  Not only did they look impressive, they certainly worked admirably when operating within their heat range.
Mazda RX-7: Part 7

While it took several months of track-induced stress, our MMC rotors eventually cracked. That's too bad. Not only did they look impressive, they certainly worked admirably when operating within their heat range.  View Related Article

 

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