[Def]

Altering the cam timing does not make the turbo act like a twin scroll. But it does change the engine's powerband.

This is exactly what Nissan's VCT did on S14/S15 SRs. It just step changed the intake cam's phasing by about 20 crank degrees IIRC. So you could advance it and really help the bottom end and bring the turbo up to speed earlier, then let it go back to the retarded position for better cylinder filling as the stock setup's exhaust port pressure increased. This is also why it doesn't do that much for power when you put big cams on the engine and free up the exhaust. You've essentially got so much cam that moving it 20 degrees ends up hurting large parts of the powerband almost as much as it helps it.