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2010 Legacy GT LTD 6 spd
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The 03 is the most mod-unfriendly forester I have seen. You will probably need to check out rs25.com or nasioc and look into 03 imprezas since they have the same issue with the ecm being untuneable. There have been many impreza owners that have swapped ecm's with other model years, the pinouts are not exact from what I recall but the issue is the same.

I looked wide and far for this very same thing, the best I could find was the megasquirt system, that can piggyback or completely control the engine. How far you want to take it depends on your comfort level and abilities. There is an entire forum dedicated to MS so you are sure to find help on that front. Good luck to you and please post back here for the benefit of others finding themselves facing this dilemma.
 
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