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They won't crack if they're true Brembo's. The only proven time that cross-drilled rotors crack is if the holes were drilled after production of the rotor, Brembo doesn't use this process due to this factor. Besides, I don't think manufacturers like Porsche and Ferrari would equip their cars with big performance cross-drilled's if they just gonna crack because it's cold or ridden on too hard. A G20 won't have nearly the clamping power of a high end Italian car, so I wouldn't worry about it. Only cheap cross-drilled's crack. When you get condensation on a cold night, during warm-up you might notice a momentary series of jerks with a dull tapping noise. This is just the rotor warming up getting rid of the condensation that has gathered on the rotor. I hope you notice a difference, please inform me (or us), I'm curious. I wanted to buy some, but didn't know if anyone had tested them first.
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