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Dimman you're correct, twin scroll means divided turbine housing nothing more.
There's a difference between "consistent power across the rev range" and "best power at high rpm". The reason BMW is able to achieve high boost at low rpm is that their turbo had low-midrange focus, since they don't use variable vanes (or do they?). At any rate, just looking at a dyno chart you can see that the torque is flat probably because the boost is being limited, and the dying high end power points to that conclusion as well.
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