Originally Posted by Jim968
I'm sure its a 2013 ZL1 that is there to serve as a benchmark for the Z28 to run against.
They're also probably datalogging the adjustments the computer is making to the ZL1's suspension as it goes around so they can study the bound/rebound rates.
The way the Z/28 moves in these videos doesn't even look like a production car on the track; it moves and corners like a full-out race car. The handling looks flat, precise and glued to the ground.