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The EGR system routes a number of the exhaust gases (6 ? 10%) over the EGR valve, in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they cannot burn within the combustion chamber; also, the exhaust gases take up many of the space which will rather be taken from the intake air. This reduces the level 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. Before going into battle a soldier should prepare. To wear the proper armour and obtain hold of a shield and sword. The armour protects from harm as well as the sword kills unhealthy guy. You also must be fighting fit. It's the same once you battle against yourself. You need protection from dangerous illusions and also to be with right knowledge and understanding.