Yes, I found about cooling rings on page 165 of an owner manual
I may be wrong about years if C7 and C8, but I know GM states for C8s that the only time the ducts be installed is on track
because on streets the ducts might be too low and get ripped out hitting something on the road, even more so if the car was lowered
You would have to check your ride height before installed, all the time
Though if the C7 ones are like the C8s they are 2 pieces and people install the top part and leave that for street and trace and for track then install the lower piece