The car wants any changes to tire diameter to be within 3% of the stock diameter. otherwise you get a stabilitrak warning.
Just google "camaro6 stabilitrak tire change" and you will find multiple threads. There are some work arounds if you have a tool that lets you get into the settings.
here's one thread:
https://www.camaro6.com/forums/showthread.php?t=619578
EDIT: sorry, it may be front/rear ratio, not comparison to original tire size.