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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. First this is a good plan to plan the first date that can take place in a public place. It is easy to lie on the internet and you don't wish to get yourself to be a victim of an online predator. To be safe, you'll want to suggest meeting at the place of the date instead of getting into a vehicle with someone you cannot know. Plan to start dating for your daytime and it's also usually a wise decision to own almost no alcohol involved. If you are still uncertain about meeting for security reasons, you ought to suggest a group date where each of you brings various friends.