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There are different reasons for EGR, the typical reason usually being to reduce the temperature in the combustion chamber to prevent the forming of nox. My California emissions engine apparently did not require EGR for that purpose.
The purpose I would be wanting EGR for would be to simply fill the intake with inert gas (no oxygen) instead of having so much vacuum. It takes engine horsepower to create the vacuum. The assumption would be you would allow some exhaust gas to flow into the intake when the throttle is partially closed. I could do the same thing with a big nitrogen bottle, it would just need refilled. My assumption would be that cooled post cat exhaust gases would be the closest thing to a freely available gas without oxygen.
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