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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. If you're at the time your health that you realize you're heading inside wrong direction which suggests you're producing an unacceptable results then simply in most cases target your product of the you're doing today. Trust me this makes quantity of difference and you'll almost see small and/or big result quickly. I know that is easier said then done just make sure add courage and persistent practice to your constant thought pattern that's saying "it's time and energy to increase the risk for necessary changes" then I'm certain you'll make great progress in living an even more happy and fulfilled life.