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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. 7. Using distractions If you want to buy your high school diploma online you will then be needing a stride by step guide of the same and you can find the following. Virtual schools aren't any more an alien phenomenon and highschool diploma online are accepted by universities and colleges, and in many cases employers. Yes you will find scams available but to save lots of yourself through the scams, you will need the right help guide acquiring the right highschool diploma online. Here's how: