You can tell the difference between V1 and V2 With all the connector on the underside of the throttle system. V1 uses three more compact plugs for camshaft placement, crankshaft place, and also the knock sensor even though V2 brings together these into an individual 12 pin connector.Ej20 engine for sale in ukSubaru legacy gt bp5 bl5 ej20 engine Ej2