Under the hood of the 640i Gran Coupe is BMW's 3-liter inline six-cylinder engine, making 320 horsepower with the help of direct injection and a turbocharger.
Back to 2013 BMW 640i Gran Coupe review
July 23, 2012 2:18 PM PDT
Photo by: Josh Miller/CNET
| Caption by: Wayne Cunningham
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