More efficiency for an inefficient vehicle. BMW is really testing our memory and powertrain-matching skills with its 2011 lineup. One of our favorite current engines is the N54 twin-turbo 3.0-liter inline-six, which produces 300 hp and 300 lb-ft of torque in nearly every model in which it’s installed. But, as you probably know, it is being gradually replaced by an evolution of that mill, the N55 single- turbo inline-six, which still displaces 3.0 liters and produces identical horsepower

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2011 BMW X6 to Get Single-Turbo N55 Inline-6, 8-Speed Transmission – Car News
This issue is much talked about. I guess it’s good news for the BMW fans