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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. 2. How aggressive they are 5. The concentration of their language I have acknowledged that desi ghee is less fattening then oil and other so called fat-free similar products. The concept behind this statement is desi ghee (butter oil from Buffalo milk) as naturally produced contains the tendency to have smoothly digested. Naturally produced foods are invariably beneficial and healthier than other forms.