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Dip is a function of cam and tuning for max power at 7000. Tune for 7000 rpm peak and apparently you get anti-tuning at ~half that. I have (had) the same dip on my tweaked 240z 3.1. Doesn't matter what you do with the fuel maps and ignition timing if the engine simiply isn't breathing well at that rpm.
Forced induction should minimize the dip. You're no longer relying as much on low pressure in the cylinder to draw charge in better as the intake opens.
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