Subaru Outback
4 Answers
The EJ253 is SOHC. The EJ254 is a DOHC engine so I foresee problems as this is not a "bolt in" swap if that is what you are looking for. What country are you in? I don't think the EJ254 is a US spec engine.
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Japanese import and I'm in New Zealand, thanks for the help
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That might be legal where you are but be warned you may have a hard time getting parts for the engine. In the states there is no support for grey market engines and they are not legal to use either. Good luck!