A self contained EGR system consists of a spacer insertable between the intake manifold and the cylinder head of an automotive type engine, the spacer including air/gas flow passages each aligned with an intake manifold runner and a cylinder head intake port, and a corresponding number of EGR gas distribution passages at least partially surrounding each air/gas flow passage with controlled size inlet ports between the two passages for passage of EGR gases into the intake ports, and an EGR valve to control the flow of EGR gases, the valve being mounted on the spaces.