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The EGR system routes a number of the exhaust gases (6 ? 10%) from the EGR valve, last on the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they cannot burn in the combustion chamber; also, the exhaust gases take up a number of the space which would preferably be taken with the intake air. This reduces the volume of intake air readily available for the combustion process during each Power Stroke; which in turn decreases the peak combustion temperatures. This brings about lower NOx emissions. How often do you think about career advancement? I recall an occasion within my life when I lived every day that it were simply a step on the method to the landing of success. That was until I stood a conversation having a Janitor, Bobby that helped me put all things in perspective. I have over 2 decades of success like a business person in primarily medical care and I am grateful that I had a possiblity to meet and turn into educated by Bobby when I did.