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Not sure if it would be a good idea to get totally rid of the EGR. Even though it would be supposed to keep the engine cleaner, removing it would eventually require a higher fuel volume to keep the air/fuel ratio to avoid knocking. Adding steam either to complement or totally replace the EGR is still likely to provide some benefits and keep the engine cleaner, eventually decreasing the amount of sticky oil residues from the PCV on the intake manifold.
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