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The EGR system routes a number of the exhaust gases (6 ? 10%) from the EGR valve, last on the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they cannot burn in the combustion chamber; also, the exhaust gases take up a number of the space which would preferably be taken with the intake air. This reduces the volume of intake air readily available for the combustion process during each Power Stroke; which in turn decreases the peak combustion temperatures. This brings about lower NOx emissions. When making the choice on what instrument to learn, there are many considerations like natural ability and skill, expense of equipment, time necessary for practicing and space availability. When you have settled on your instrument of, the genuine work begins: perfecting your technique and having the very best musician you could be. You might decide on out your drums.