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I'm not aware of changes to the intake, but I do believe that the Z1 also has EGR on it.
I'm sure the intake is tuned for low-rpm high velocity flow, though, keeping flow rates up under low vacuum, to increase VE.
That was also the case w/ the USDM D15B8 (HF engine) which also had EGR and smaller runners (cross-sectional).
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