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The EGR system routes a number of the exhaust gases (6 ? 10%) through the EGR valve, back in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they do not burn inside the combustion chamber; also, the exhaust gases occupy a few of the space which may otherwise be taken from the intake air. This cuts down on level of intake air readily available for the combustion process during each Power Stroke; which often decreases the peak combustion temperatures. This ends in lower NOx emissions. Do you like to create something more important and unique from others? So, people will give a lot of compliments for your ideas. If the answer is yes, then I am sure you participate in enneagram type 4. Enneagram type 4 is a personality where your image is like this- "I am different. I?m nothing like you."