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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. 1. Cheaper: Eonon offer you the cheaper price though highest quality Car DVD for you. Taking significantly less cash to 'fill up' than oil burning engines in the Car DVD. You can charge them the whole night from the domestic electricity supply, and determined by your practical company this is reduced by taking benefit of off peak tariffs. Your motoring costs will probably be slashed.