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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. TRIVIA: By the age of six, Jackson had been working in a South Carolina textile mill like a clean-up boy. Twelve-hour days were not uncommon being a young teenager, and Joe received little in the form of formal education. Sadly, he never learned to learn or write, and in later years would loose time waiting for teammates to order off the menu after which order for himself by repeating something he'd heard. 3. How confident they are