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The automobile is often a complex machine comprised of different components each having a specific role. Fuel is processed within the engine where it is changed into souped up that moves the vehicle. Exhaust from your combustion process is filtered to render emissions less harmful to the environment. The transmission system feeds more power to the engine for the car to increase its acceleration. Has there have you ever been a time in your own life that you couldn't crunch for tomorrow into the future? or possibly didn't desire to go to sleep due to you was having a real wonderful time? You need to have felt like that at the very least once that you experienced, right? I bet you even have a big smile on your own face simply remembering those 'smart times'... 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.