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The EGR system routes a number of the exhaust gases (6 ? 10%) through the EGR valve, back in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they do not burn inside the combustion chamber; also, the exhaust gases occupy a few of the space which may otherwise be taken from the intake air. This cuts down on level of intake air readily available for the combustion process during each Power Stroke; which often decreases the peak combustion temperatures. This ends in lower NOx emissions. 7. Using distractions The average advertised price to switch 4 tires is $400 to $600 for that top tire size sold. Even $1000 isn't impossible. Insuring that you will get one of the most mileage from your tires is really important. Tires are the link between the car as well as the road, and they are constantly put through the forces of acceleration, stopping and turning for a vehicle that weighs about over 4000 lbs.! Of course you?re going to see tire wear, though the longer you possibly can make your tires last, the less cash you will spend maintaining this part of your automobile. Keeping your tires who is fit requires not only keeping an eye on tire wear and air pressure. It also means practicing safe driving habits, avoiding improper habits, and maintaining all of the aspects of the steering and suspension systems