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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 may be Once you have settled on your theme, click on the Desktop Background option at the bottom of the Personalize window. Here you can see all the images within a particular theme and tick or untick them, removing unwanted ones from your cycle of images. You can also choose how the picture is shown on-screen, although leaving it in Fill mode will be fine unless you start using odd-shaped images. There is also a Shuffle tick box, allowing you to muddle up the order of the chosen images, so you won't know what is coming next. 7. Using distractions