All hail the quad-turbo BMW M550d xDrive | Top Gear
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2013 BMW M550d - ENGINE [M Performance] - YouTube
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BMW B57 - Wikipedia
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BIMMERPOST Review: M550d xDrive [M Performance Automobile] - 2010 2011 BMW 5 Series Forum F10
Quad-turbo BMW M550d xDrive is ultimate diesel Q car | CAR Magazine
Four turbos are better than three: BMW debuts new quad-turbocharged diesel engine
BMW confirms quad-turbo inline-6 diesel engine! - Team-BHP
