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Message: <blockquote data-quote="NXcoupe" data-source="post: 628965" data-attributes="member: 11751"><p>The harnesses shouldn't be different enough to cause any problems. Both computers are OBD2 and have the same pinouts madated for OBD2 I believe. If the car starts and runs, it can be tuned with the current computer with either a chip(not recommended) or a programmer(recommended). I believe you should be able to make it go. I also know that you can use a 2V harness and computer to run a 4V with no issues. I had a customer come in with a 98 GT that had an -04 Mach 1 engine in it, and he was convinced it had a mach one computer in it as well. I finally had to pull the kick panel and look, and there was his stock 2V computer in there. I tuned it using 2V parameters and made killer power with it. He was happy and all his drivability concerns went away. Hope this helps some. You did do a delete plate on this right? If not your secondary air valve plates, IMRC, could be hooked up to an rpm activated switch and a wire ran to the factory solenoid. It works pretty well for some guys around here.</p></blockquote><p></p>