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Message: <blockquote data-quote="95PGTTech" data-source="post: 210372" data-attributes="member: 9525">EGR, or exhaust gas recirculation, was implemented to reduce levels of oxides of nitrogen (NOx's) being produced by the motor and exiting out to the atmosphere. It does so by recirculating spent exhaust gases back into the intake manifold to enter the combustion chamber a second time.Contrary to popular belief, these gases ARE NOT reburned. Because all the oxygen and fuel is spent, there is nothing to re-burn. The spent gases simply take up space inside the combustion chamber that would normally be taken up by fresh air and fuel - therefore reducing power output considerably, and, as the goal is, to lower combustion chamber temperatures (the higher temperatures are what cause massive amounts of NOx production).At WOT or heavy throttle situations, the EGR does not recirculate, so you won't be seeing any real performance increase - likewise, since nothing is being reburned, you will also not see any fuel economy increase or decrease.A helpful link:<a href="http://en.wikipedia.org/wiki/Exhaust_gas_recirculation" target="_blank">http://en.wikipedia.org/wiki/Exhaust_gas_recirculation</a>Hope that helps.- Julia</blockquote>