Here come the first mass-produced aluminum cars. On Oct. 23, Alcoa unveiled plans to build a $70 million plant in Soest, Germany, to supply Audi with parts for an aluminum car expected in 1994. The two companies have been working since 1982 on a new manufacturing process for cars with aluminum structural components, or "space frames." The result: a 35% weight reduction. The peak production of 100,000 or so annually would far surpass the roughly 6,000 NSX aluminum sports cars built by Honda. Alcoa expects several more new plants.

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