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The EGR system routes many of the exhaust gases (6 ? 10%) through the EGR valve, last on the Intake System, and in the end in the combustion chamber. The exhaust gases are inert i.e. they don't burn within the combustion chamber; also, the exhaust gases use up a number of the space which could preferably be taken with the intake air. This decreases the volume 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. '10 February. The Peregrine flew north across the valley. He was half miles away, but I could see the brown and black of his wings, the shining gold of his back. The pale cream of his tail coverts looked like a band of straw twisted across the base of his tail. Thinking he'd return downwind, I went into fields with the river to watch for him. I stood in the lee of the hawthorn hedge, looking through it on the north, sheltered in the bitter wind' 2. How aggressive they're