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. Making use of lines in photography is really a photographic composition technique used by many professional photographers, and for good reason. Lines - also referred as 'Leading Lines" - enables you to lead a persons vision to the point of interest and prevent a person's eye from wandering. Lines can put emphasis on distance or illustrate a relationship to foreground and background elements. Keep in mind that using lines incorrectly will surely have the alternative effect and lead the attention out of the a growing concern.