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The Insight uses a linear-solenoid-operated EGR valve that feeds recirculated exhaust gas into an equal-length EGR manifold that is sandwiched between the intake manifold and the cylinder head.
This design ensures equal distribution of recirculated exhaust gas between the three cylinders and prevents the exhaust gas from liquefying before reaching the intake ports.
This high-precision EGR system is required to help control NOx production during lean-burn operation.