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When turbo or supercharged, you'll need to run the port injection to some degree because the DI alone can't handle the requirements for boosting.
Also, I was under the impression that it was the DI that allowed the boosting of our engines with such high compression, and that stock, at highest load/redline that the engine runs mainly off of the DI.
For boosted, I would suspect that the DI is running full blast and the PI is added in as needed at highest loads/rpm.
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