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The EGR system routes a number of the exhaust gases (6 ? 10%) over the EGR valve, in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they cannot burn within the combustion chamber; also, the exhaust gases take up many of the space which will rather be taken from the intake air. This reduces the level 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. Game graphics quality has skyrocketed over the past a long period as developers push to get more pixels and much better models, and many mods are located to follow along with this trend. Some concentrate on the more technical side of graphics, while some try to enhance the more aesthetic side of Oblivion's design. No matter your interest, choosing strongly advised to look into the following Oblivion mods.