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The ecu controls fuel and timing, and should have nothing to do with boost. I too had thought 15 lbs. of boost from a bigger turbo would produce more hp than the stockers because of the "volume" of air and not the "pressure," but was corrected in a post a few weeks ago. Here's the link: [ http://twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=965950 ] You do have to upgrade your ECU when going with the larger injectors, (lets the ECU know you can now provide more fuel).
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