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Hello guys,
I recently blew my ej255 engine for my 2011 Subaru wrx and purchased a ej20 would I have to do any other modifications to make this work? Such as getting a new Ecu
 

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By engine do you mean long or short block? Also what EJ20?

EJ20E? 20D? 20k? 20g?

Or do you mean an EJ205? Or 207?
 

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XJ pretty much covered it. What heads you are using will matter most, and there are a lot of different models of ej20 engines, and differences within those models. Some will work with less additional work than others.. some I wouldn't suggest using at all.


Whatever the case, you will need a tune minimum regardless of what engine it is.
 
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