Through the 1970s and early-1980s, three Japanese companies, Toyota, Nissan and Honda upended the American automotive industry. With the help of lower manufacturing costs in Japan and favorable exchange rates, they entered at the low end of the market and offered consumers, affordable, higher-quality and more efficient cars than they could get from Detroit. After gradually filling in their lineups from the bottom up, by the end of the decade, all three were ready to expand into more premium offerings. After Honda launched Acura in 1986, Toyota and Nissan brought us Lexus and Infiniti three years later. Thanks mainly to the flagship Lexus LS sedan, the premium car market has never been the same and I recently spent a week with the latest edition of the LS460 AWD to see how it has progressed in 25 years.