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The purpose is to show how to know if your truck with a 6.8 V10 has EGR or not. Even though my truck is registered and sold here in California, it was not built with an EGR system. Odd for California, but good for me! EGRs cause so many problems. Here is a straight-on shot of the throttle body with the butterflies clearly visible. Unlike carbureted engines, no fuel washes over these butterflies, just dry, filtered air.