This was done when cryo treating became really popular. I remember it was a place that was 50 miles from my house. They did engine parts and medical items. They ordered the rotor from NAPA for me, got it done and had it shipped to the house. Honestly, they could have lied to me and I wouldn't be able to tell the difference when I first saw the rotors. Yet when I put it through the first track day, I was immediately sold as I did not see a single crack after my first track event
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