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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. Using real gold shampoo does have some advantages. Because it is an extra product, real gold shampoo is commonly made out of very good quality shampoo. While this might cost a bit, shampoo is just one of those actions where quality makes a difference. In general, expensive shampoo is more preferable for your hair than inexpensive variants, although naturally this can be a general rule there are exceptions.