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9. Their emotional appeal 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. The main reason why these companies overlook the advantages which can be obtained through absorbing natural compounds in the skin is the greater cost of using plant oils, waxes, and extracts. It requires less processing to make use of chemical based components in cosmetics, which ensures you keep cost down. Synthetic compounds are not any match for all those natural ones with regards to healing your skin.