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Message: <blockquote data-quote="5L5SpdHardtop" data-source="post: 542694" data-attributes="member: 11399"><p>I just thought I might put in my 2 cents here. The EGR valve's main function is to reduce emissions of oxides of nitrogen, which it does by recirculating exhaust gas into the combustion chamber. The emissions aspect isn't all that important to most mustang owners. However, the recirculation of nonburnable exhaust gasses also causes a decrease in temperature inside the combustion chamber. The system is ONLY recirculating exhaust when cruising or under light load, which means combustion temperatures will be lower during cruising and light load. Since most street driving occurs under these conditions, not only will fuel mileage be improved, but the lower combustion chamber temperatures will likely make the engine last longer as well(compared to no EGR). Since EGR never operates near WOT when functioning properly, it has no affect on maximum performance. Seems like a win-win to me.</p></blockquote><p></p>