The front 6 pistons (The fronts of the CTS-V and ZL1 are identical other than color and labels) do but the rear 4 piston do not. The reason the rears don't fit is because the CTS-V uses forward mounted rear calipers, If you do the upgrade just use the rear SS brembos. Also when ordering stainless steel lines you can have to order the ZL1 setup in order for it to work.
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