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I read about people not liking EGR. It is the best alternative to reducing NOx because it introduces O2 starved exhaust gas at low power demand conditions (idle or cruise) and reduces the formation of these pollutants. The selection of where manufacturers select the exhaust gasses is important...

Originally Posted By: JHZR2 It is a reagent in the catalytic process to get rid of NOx. In the USA, we're held hostage by California's geography and thus we can call 8 MPG SUVs "partial zero" emissions vehicles, while diesels are "gross polluters" when they return 50 MPG - and are forced to have...