FB20 Subaru EngineSubaru's FB20 was a 2.0litre horizontallyopposed (or 'boxer') fourcylinder petrol engine. Effectively replacing the EJ204 engine, the FB20 engine was a member of Subaru's third generation 'FB' boxer engine family which also included the FB25, FA20D, FA20E and FA20F engines.The FB20 engine first offered in Australia in 2012 Subaru GP/GJ Impreza.Subaru EJ257 Engine australiancar.reviewsSubaru's EJ257 was a turbocharged, 2.5litre horizontallyopposed (or 'boxer') fourcylinder engine. For Australia, the EJ257 engine was introduced in the Subaru GD Impreza WRX STi in 2005 and subsequently powered the GE/GH Impreza WRX STi and V1 WRX.Effectively replacing the 2.0litre EJ207 engine, the EJ257 engine was a member of Subaru’s Pha