If you are seriously considering buying more mods, just buy a stand alone system. (megasquirt, haltech, aem, hydra, w/e) The tuning software alone is worth it. They stand alone systems can scale to meet your demands (Usually), and you have an organization to ask for help when you &^%$ up your basemap.
If you are really determined to make an OE ecu work, look into socketing.(chipping)
Any computer is tunable if you try hard enough.
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