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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. 5. The concentration of their language Installing Bellowed Up-pipes on the diesel truck is the perfect treatment for the much too common diesel exhaust leak. The stock Ford up-pipes are made employing a crush donut gasket to seal the up-pipes to the y-collector. Over time, expansion and contraction make the donuts to leak, hurting engine performance and mileage.