As a reminder, CT4 replaces the ATS, CT5 replaces the CTS
https://www.cnet.com/roadshow/news/2020-cadillac-ct4-v-ct5-v-debut/
As a reminder, CT4 replaces the ATS, CT5 replaces the CTS
https://www.cnet.com/roadshow/news/2020-cadillac-ct4-v-ct5-v-debut/