Robert Lutz, the head of the Chrysler Corporation at the time, said in his 2003 book "Guts" that the Medallion, and its larger line mate, the Premier were "salesproof" in that no matter how attractive and competitive the cars were, customers in large enough number to ensure success just would not take notice. In reality, the corporation was drawing a tighter bead on "import intenders," and rather than working with an independent Renault, Chrysler shifted the Eagle models to badge engineered cars sourced from its Japanese partner since 1971, Mitsubishi Motors. At the time, Chrysler was investing in the Diamond-Star Motors manufacturing joint venture and building a new plant in Normal, Illinois, with an annual capacity of almost a quarter million vehicles. In 1986, Honda introduced their luxury brand Acura with the Acura Legend and Acura Integra thereby further competing in a crowded market segment.