Sports car maker Porsche AG unveils its four-door "Panamera" at a ceremony in Shanghai on April 19, 2009 ahead of the opening of Shanghai's auto show. Porsche, a small but highly profitable sports-car maker, over the past years, has gradually reduced its reliance on the troubled North American market. It now showcases the Panamera, its first four-door luxury coupe, in China to shift the focus to an auto market that is expected to become the world's largest by volume in 2009. -AFP