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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. However, it's not all good news for those those who are always researching the future searching for the subsequent best thing rather than experiencing and enjoying the present. Although it doesn't appear to have the same negative effects on his or her health as the those who are constantly looking back, they will often stop as content given that they overlook what they've and take enogh time and energy to take advantage of the present. Because of this they too are apt to have a reduced standard of living.