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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. How does one move about when walking on ice? The 1st step is usually to wear crampons, that are footwear created specifically for walking on glacier mountains as well as other difficult terrain. Crampons have pointed metal parts with them, which will help to provide strong traction. Any different of ice climbing equipment is dependent upon the texture and slope you encounter. For more difficult terrain, the climber may choose to where mountaineering boots along with crampons for further support