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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. The EGR system routes a number of the exhaust gases (6 ? 10%) over the EGR valve, in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they cannot burn within the combustion chamber; also, the exhaust gases take up many of the space which will rather be taken from the intake air. This reduces the level 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.