In for an engine rebuild: my BMW M550d Touring. Factory specs: tri-turbo diesel, 0-60 mph in 4.6 s. My engine's additional spec: leaking cylinder head. : r/Justrolledintotheshop
BIMMERPOST Review: M550d xDrive [M Performance Automobile] - 2010 2011 BMW 5 Series Forum F10
Four turbos are better than three: BMW debuts new quad-turbocharged diesel engine