One-make, or single marque, championships often employ production-based cars from a single manufacturer or even a single model from a manufacturer's range. There are numerous notable one-make formulae from various countries and regions, some of which – such as the Porsche Supercup and, previously, IROC – have fostered many distinct national championships.
One-make racing events often feature cars built by a single manufacturer or even a single model from that manufacturer's lineup.  Notable examples include the Porsche Supercup and the former IROC series, which have led to numerous national championships in different countries.