TOLEDO, Ohio (Dec. 18)—Delphi Automotive Systems did not identify exactly which of its manufacturing operations will require "portfolio management" as it shifts its focus toward high-tech electronic and electronically enhanced products in the next year. In analyst presentations Dec. 12 in New York, the world´s largest automotive supplier said it will improve its earnings performance through lean manufacturing and a streamlined organizational structure. Delphi is reviewing about $4 billion to $5 billion worth of businesses for "near term portfolio management action." A spokesman for Delphi Energy and Chassis Division would not comment on whether or not the mature brake hose production at its Dayton, Ohio, plants is core. "Everything at this point in time is up for review," he said.