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going the lean + EGR route as opposed to even more lean - EGR, it would allow for a small drop in backpressure, would also heat up the intake charge a bit as well, which has its compromises.
being a less dense intake mass, there should be less heat overall. then you go back and forth between needing more throttle to produce the same amount of power(which also has its compromises), which would probably bring the cylinder temps close to where they would be with just the super-lean ratio.
six of one, half a dozen of the other.
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