Rock Auto carries R1 concepts now, they're fair for the price. I've been using these for a little over a year with no issues aside from the brake dust. For some reason I couldn't for the life of me find the right front two piece rotor anywhere.
I went with slotted and dimpled rotors with semi metallic pads from brake performance.com.
Price was right and lifetime warranty for cracking/warping. So far so good but only 100 miles.
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