Really nice article. If the "TwinPower Turbo Technology" in the 550GT is not twin scroll, then what is it? I had thought that "TwinPower Turbo Technology" was BMW speak for twin scroll technology in the new four and six cylinder engines. Not true?
the 550i GT got the upgrade for 2013 right away. the 550i is not getting the new horse power until the face lift hits q3 or q4. Kinda bumbed about it, but I really think its just the engine is detuned. Dinan stage 2 at 501hp and does it really matter.
Piezo direct injection may mean a smaller more acurate type of injection.
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