The FA20E and FA20F engines had exhaust gas recirculation (EGR) techniques by which the piping was integrated into the ingestion manifold. Besides providing much more uniform gasoline movement for the cylinders, a cooling circuit enabled increased exhaust gasoline volumes to be recirculated than occurred from the EJ engines. Very good http://www.usaonlineclassifieds.com/view/item-834040-Naddour-s-Custom-Metalworks.html