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Old 09-10-2019, 10:32 AM   #158
Scooby Specialist
Member#: 262117
Join Date: Oct 2010
Chapter/Region: Tri-State
2001 Forester STI


Tuner here.

These things require a retune to touch it up a little. The 2.5 US tune is not really ideal for these JDM motors at all. Between the smaller displacement and high compression ratio, the OEM tune is a problem waiting to happen.

It may "feel" like its running fine , but feel is only the tip of the iceberg compared to whats happening under the surface there. Based of the reputation that subaru motors will blow up by just changing the paint on your rear passenger door, never ever assume because it feels fine that it is running fine. Any changes or deviations from stock or what you are tuned for absolutely, positively requires a retune, or at the very least, datalogs to a knowledgeable pro who can look things over and make that determination.

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mikeydrives1 is offline   Reply With Quote