Problems swapping EJ255 with EJ257?
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This is a discussion on Problems swapping EJ255 with EJ257? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; My 08 WRX's motor went out and I need to put in a new engine, or at the least a ...

  1. #1
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    Problems swapping EJ255 with EJ257?

    My 08 WRX's motor went out and I need to put in a new engine, or at the least a long block. I figured this might be a good opportunity to throw in a STI motor and get a few extra HP out of it. does anyone see any problems with this? I know I would have to change the ECU on it, but other then that would it be compatible? Also does the STI even get its extra HP from the Motor? I know the only real difference in the two is the heads.

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  3. #2
    Moderator Donkey's Avatar
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    The STI long block will not add any additional power.
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