2.5 RS-STI Swap This engine was never sold in the United States. It is an 8250RPM Redline Japanese EJ207; 2Litre Turbocharged Flat 4. Mods are to many to list... All internals are forged and balanced, the crank is nitrided, the pistons, exhaust headers, turbocharger turbine, up pipe, downpipe are all ceramic coated, all ports are gasket ported and gasket matched, etc..