An intake manifold, comprising: an intake gas duct configured to allow a fresh intake gas to flow therethrough; an exhaust gas recirculation duct; an EGR flow measurement system, being integrally formed into the intake manifold, defining a portion of the EGR duct and configured to measure a differential pressure of a recirculated exhaust gas passing therethrough; and a mixing duct being positioned downstream of the intake gas duct relative to a direction of the fresh intake gas flow and also being positioned downstream of the EGR duct relative to a direction of the recirculated exhaust gas flow, the mixing duct being configured to mix the fresh intake gas and the recirculated exhaust gas into a mixed intake gas, the mixing duct being integrally formed into the intake manifold, wherein the EGR flow measurement system comprises: a converging section and a diverging section positioned downstream thereof, the converging section and the diverging section defining a connection; a high pressure passage, a first end of the high pressure passage being connected to one of the converging section and the connection; and a low pressure passage, a first end of the low pressure passage being connected to one of the connection and the diverging section, wherein the EGR flow measurement system comprises a venturi insert forming the converging section and the diverging section. an intake gas duct configured to allow a fresh intake gas to flow therethrough; an exhaust gas recirculation duct; an EGR flow measurement system, being integrally formed into the intake manifold, defining a portion of the EGR duct and configured to measure a differential pressure of a recirculated exhaust gas passing therethrough; and a mixing duct being positioned downstream of the intake gas duct relative to a direction of the fresh intake gas flow and also being positioned downstream of the EGR duct relative to a direction of the recirculated exhaust gas flow, the mixing duct being configured to mix the fresh intake gas and the recirculated exhaust gas into a mixed intake gas, the mixing duct being integrally formed into the intake manifold, wherein the EGR flow measurement system comprises: a converging section and a diverging section positioned downstream thereof, the converging section and the diverging section defining a connection; a high pressure passage, a first end of the high pressure passage being connected to one of the converging section and the connection; and a low pressure passage, a first end of the low pressure passage being connected to one of the connection and the diverging section, wherein the EGR flow measurement system comprises a venturi insert forming the converging section and the diverging section. a converging section and a diverging section positioned downstream thereof, the converging section and the diverging section defining a connection; a high pressure passage, a first end of the high pressure passage being connected to one of the converging section and the connection; and a low pressure passage, a first end of the low pressure passage being connected to one of the connection and the diverging section, wherein the EGR flow measurement system comprises a venturi insert forming the converging section and the diverging section.