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If you are not in great shape to begin with, it isn't recommended you try this system because of a greater injury risk. If you still have considered trying it, it's recommended that you enter a good shape in advance. This can be easily accomplished by performing exercises on a regular basis and simply being consistent. The EGR system routes a number of the exhaust gases (6 ? 10%) through the EGR valve, back in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they do not burn inside the combustion chamber; also, the exhaust gases occupy a few of the space which may otherwise be taken from the intake air. This cuts down on level of intake air readily available for the combustion process during each Power Stroke; which often decreases the peak combustion temperatures. This ends in lower NOx emissions.