I am sure the ZL1 will be the same, but the CTS-V is only a few thousand dollars from getting 600hp to the wheels. And as much as I love my Camaro, the SigmaII is a chassis without peer. It's like a Zeta that's tuned that much better. And it's hard to beat the V's wow factor. Just make sure you compare the Recaro to the base seats to your Camaro, and make sure you can live with it. Because the Camaro seats are much more comfortable than any CTS seats. That black diamond color
Oh, and if you are in the midwest, there's a tuner who knows the V inside and out.