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Subaru 2008 WRX JDM engine swap

EFI Tuning Fundamentals

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Hi! I'm new to this courses, understand a little and ready to start practicing. I bought a 2008 WRX sedan, that had been through an engine swap. The original engine was the USDM 2.5L, the ECU still for that engine, but they swap to a JDM 2.0L EJ205 engine, they used some parts of the 2.5 like the top parts (intake manifold and don't know what else) to use the same wiring harness but they didn't adjusted the tune for the 2.0L. so definitely hasn't been running with the proper AFR or Timing. Does some one has experience with this type of swap? what would be the best platform to do it? Any help would be awesome. Thank you!

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