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You can compare the caliper to what Stoptech and Brembo have for piston sizes. I couldn't find them but I didn't look to0 hard. Also look at what the stock F30 piston sizes are.
The piston sizes for the CTS-V are 44mm and 40mm for the 355mm rotor (4 piston) and 38mm, 34mm and 30mm for the 380mm rotors (6 piston).
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