Every few years, it seems, NASCAR changes its Cup cars. Iterations have been Generation 1 (cars that ran from 1948-1966), Gen 2 (1967-1980), Gen 3 (1981-1991), Gen 4 (1992-2006), Gen 5 (also known as the Car of Tomorrow, 2007-2012), Gen 6 (2013-2021) and the so-called ‘Next Gen’ cars (also known as Gen 7, 2022-present).