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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. The woodwind section will glare in the drummers. The brass section sticks their noses up at them. And then they emerge about the field one day minus the drum line and you know what? No one can march for the life of them. No one can keep their steps. Lines are squiggling forward and backward. Formations which are once crisp and defined have become sluggish and bloated looking. That perfectly formed capital 'O' this rock band worked so difficult on a week ago now resembles a half-hearted 'U'. What is wrong with everybody? Suitable for wheelchairs and pushchairs, this Torquay town walk, marks the resort's link with Agatha Christie, it's most popular inhabitant. Starting from Torquay's Tourist Information Centre it will require you throughout the harbour and beach areas. Covering reasonably flat ground and ten landmarks, children and adults will enjoy solving the mystery on the way, with lots of chances to avoid on an ice-cream or coffee, and even look for the numerous geocaches hidden along the way.