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GM's Volt engineer Weber moving to Opel

Frank Weber, the German-born engineer in charge of the Chevrolet Volt, is moving back to Germany to take a senior management role at Opel. He will be replaced by Doug Parks, who has been working at Opel since 2007 as chief engineer for GM's global compact cars, which include the Opel Astra and Chevrolet Cruze. General Motors Co.

Kia to debut 2 midsize sedans within 6 months

Kia plans to replace its slow-selling Amanti sedan this year--close on the heels of the similarly sized, redesigned Optima sedan now being rolled out. But the exact timing of the launch is undecided. The Amanti replacement, tentatively called the Cadenza, had been expected in April.

Porsche Panamera convertible plans uncovered

A series of European and U.S. patent applications obtained by AutoWeek show that Porsche remains committed to building a four-door convertible version of its flagship Panamera, despite recent comments from Zuffenhausen insiders indicating the car had been canceled. The new car, depicted in official drawings that accompany the latest Porsche patent applications filed in February, eschews the two-door route taken by all of its upmarket rivals for a practical four-door body.