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The new BMW 650i Convertible is powered by a 400 horsepower 4.4-liter V-8 engine which makes peak torque of 450 lb-ft between 1,750 and 4,500 rpm and is mated to an 8-speed Sport Automatic transmission. The new 650i Convertible will go on sale in the spring of 2011 as a 2012 model for the United States. The current model 650i Convertible starts at $85,550.