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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. However, the heavy carat diamonds usually are not easily approachable for average people. But you hold the privilege to take pleasure from hip hop look wearing light rap jewelry items. In fact, the designers produce many of the master pieces with small diamonds clustered together forming one big stone. These pieces may cost less.