The Chrysler 300 "letter series" are high-performance luxury cars that were built by the Chrysler Corporation in the U.S. from 1955 to 1965. After the initial year, which was named 300-C, the 1956 cars were designated 300B. Successive model years given the next letter of the alphabet as a suffix, reaching the 300L by 1965, after which the model was dropped. The 300 "letter series" cars were among the vehicles that focused on performance built by domestic U.S. manufacturers after World War II, and thus can be considered one of the muscle car's ancestors, though full-sized and more expensive. The automaker began using the 300 designations again for performance-luxury sedans, using the 300M nameplate from 1999 to 2004, and expanding the 300 series with a new V8-powered 300C, the top model of a relaunched Chrysler 300 line, a new rear-wheel drive car launched in 2004 for the 2005 model year. Unlike the first "letter series" series, the successive variants do not feature standard engines producing at least 300 hp, except for Chrysler's current top-line 300C models.