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You would be correct, I am using it as filler to lower effective displacement.
That may eventually lead to leaning the mixture (to enable even less fuel injected and lower power output). However, at this time I have no way of trimming fuel or adjusting ignition timing beyond the stock ECU, so we'll see how it deals with it. I know the O2 sensor will correct for the fuel injection. I'm just unsure of how it'll handle the ignition timing. I know leaner mixtures burn slower, so timing advance may be needed. But this really isn't a lean mixture, its still stoichiometric. But, it has filler like you say, so the gas and oxygen molecules will be farther apart. This will probably be the main limitation of the EGR system. If that is the case, I will likely have a bit of leeway to start leaning things before nox even becomes a problem due to the cooler burning nature of an EGR mixture. Using or modifying the head to be a high tumble/swirl head would likely increase the effectiveness of this modification (as it does with lean burn).
I hope that makes sense. That was kind of stream of consciousness there.
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