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I was thinking about put a JDM EJ20 SOHC non turbo  motor into a 1998 Outback that has the factory USDM EJ25 DOCH motor.  Can I swap the intake manifolds, like you could,  on a  USDM SOHC EJ25?   If so then has anyone done this and what (if any) are the differences in the two swaps?   Thank you for taking the time to read this.  

 

 

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That depends. The EJ20E motor will work with an EJ22E manifold and wiring harness. But EJ20E is almost non existant anymore.

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I should have specified that I am looking at a EJ203 non turbo JDM from Japan Direct in Ontario Canada. 

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Per this: https://en.wikipedia.org/wiki/Subaru_EJ_engine The EJ203 is Phase 2 / II engine. You'd need a Phase 1  / I engine. So, your IM won't fit regardless. Easiest swap is the '95-98 USDM EJ22e. It's been covered on here a lot.

There is a Phase 1 JDM EJ20D DOHC (NOT the EJ20G/K/R turbo versions), listed in that link too, which should work w/your IM, but not sure those were ever imported to the US for swaps. Not sure I've ever seen one.

Edited by wtdash

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