The COT era in NASCAR was a weird one, not necessarily defined by racing but by everything all put together. It was a short time, only five and a half years in the sport (the fewest times for a car generation in NASCAR outside of the still ongoing Next Gen racecar) by a pretty wide margin. It was both aesthetically and in usage a controversial change that defines the end of NASCAR’s most popular era and the start of the downturn that the sport still sees itself to this very day. So let’s look back at NASCAR’s COT era.