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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. Suitable for wheelchairs and pushchairs, this Torquay town walk, marks the resort's link with Agatha Christie, it's most famous inhabitant. Starting from Torquay's Tourist Information Centre it will take you throughout the harbour and beach areas. Covering reasonably flat ground and ten landmarks, children and adults will love solving the mystery in the process, with plenty of chances to prevent for an ice-cream or coffee, or even seek out the many geocaches hidden en route.