EJ22 SOHC to EJ25 DOHC engine swap - Subaru Retrofitting for EJ engines you want to make certain you have Subaru OEM spark plug wires (or magnecor) and NGK plugs. they are not very forgiving motors when it comes to ignition components. if you're still buckwild about an engine replacement - get a used EJ22 (far cheaper and more reliable than the EJ25) and put a turbo on it. Subaru 2 Engines are Known for Cooling Problems Subaru 2 engines have a mixed history of cooling, head gasket and oil leaks. There are specific ways to test a Subaru 2 engine for leaks, and not all testing methods provide reliable results. There’s a difference between OEM and aftermarket parts for Subaru engines ('03-'05) - Exploded Diagrams | Subaru Forester Owners Forum EJ25 - 2 Non-Turbo (1998-2010) Exploded Diagrams ('03-'05) Is there a good source for a PDF of exploded engine diagrams for the 2004 Forester X? We’re the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, Synergy Engines - Subaru EJ257 Crate Engines EJ255 Version 1: Used in the 2005 and 2006 Legacy, as well as the 2004 and 2005 Forester. This engine uses the same shortblock and heads like EJ257 in US 04-06 STI. EJ255 Version 2: Used in the 2006-2008 WRX, the 2007+ Legacy, and the 2006+ Forester.