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My 98 and 99 dodge diesels don't have egr, but I think the new diesels have water cooled egr. In my view, the egr is a poor smog control device. Maybe someone can educate me on the benifits. It cools the combustion therefore reduces the nitrogen oxides, but at the same time increases the hc output (aka unburned fuel). Eco mods should have the main goal of useing all the fuel you send through the motor. I see hc co2 and co as the main source of air pollution. It doesn't seem to me that no no2 no3 or whatever the nitrogen oxides that come out the tailpipe are constitute pollution. What happens to them when they get broken up by uv in the upper atmosphere? The free nitrogen or free oxygen will not be harmfull to anything. The chemistry might be beyond my understanding though.
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