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Although the original 1990 Lexus LS was a radical departure from any previous Toyota product, the brand's flagship sedan has evolved in a far less radical fashion over its 23-year lifespan. In fact, the second-generation model, which debuted in 1994, was virtually indistinguishable from previous models despite sharing only 10 percent of its content. The fourth-generation LS, which debuted in 2006, broke considerable new ground in terms of styling and technology, but has been relegated to minor nips and tucks in the years following its debut.