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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. Adjustment disorder with anxious features Initially, Superboy-Prime was the sole superhero on Earth Prime, one of the alternate variations of Earth that existed inside universe of DC Comics. Based on the storyline, each of the alternative Earths had to be eliminated to sustain one. At the end of that cataclysmic series of events, Superboy Prime, as well as Earth-Prime 's Lex Luthor and Kal-El, another alternate version of Superman, voluntarily confined themselves to some heaven -like measurement to avoid wasting the universe. With prompting from the Lex Luthor trapped with him, Superboy-Prime resolved to fix the blunder he made and ultimately broke free. In other words, he was intent on returning the presence of Earth Prime, a target he could attain only by destroying the current Earth.. .... ..