back to the future locomotive

French Spiderman Alain Robert has finished his latest climbing the tallest building in the world. Alain has successfully reached the top of the tapered spire higher than the 160th floor with the building. The 47-year-old is known for climbing buildings all over the world just using bare hands and climbing shoes. The EGR system routes a number of the exhaust gases (6 ? 10%) from the EGR valve, last on the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they cannot burn in the combustion chamber; also, the exhaust gases take up a number of the space which would preferably be taken with the intake air. This reduces the volume of intake air readily available for the combustion process during each Power Stroke; which in turn decreases the peak combustion temperatures. This brings about lower NOx emissions.