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The EGR system routes many of the exhaust gases (6 ? 10%) through the EGR valve, last on the Intake System, and in the end in the combustion chamber. The exhaust gases are inert i.e. they don't burn within the combustion chamber; also, the exhaust gases use up a number of the space which could preferably be taken with the intake air. This decreases the volume of intake air available for the combustion process during each Power Stroke; which experts claim decreases the peak combustion temperatures. This leads to lower NOx emissions. What rockhound just isn't acquainted with the red and yellow flowers, orbs, and poppies within this highly preferred cutting material? We have all 'ooohed and aaahed' viewing the slabs and cabs at gem shows. With each cut exposing a succession of unexpected patterns I have often been surprised at my finished gems, (though I would always say, "Yep, that is the look I was opting for.")