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there are projects with certain cars to accomplish this. Subaru's have a large following at openecu.org for doing this, although there has been speculation that these guys stole most of their work from other companies that sell subaru tuning software/hardware.
Like said previously, you need to know what you're doing. Each ECU has completely different software so there is no single place for ignition timing/fuel trim etc. in every ECU.
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