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Message: <blockquote data-quote="Magic" data-source="post: 664667" data-attributes="member: 9430">On what ground does your tuner "highly suggest" that you spend the extra time and money on the 03/04 wiring harness and ECU?You will save time and grief by re-using all of your existing wiring and ECU. The 2 main things that you will have to consider are running the intercooler/heat exchanger pump in some way/form, and whether or not you want to convert over to coil-on-plug ignition or stay with the coil pack ignition.Any reputable tuner SHOULD be able to tune ANY engine combination using your existing electrical/computer.I really dont understand why your "tuner" wants you to swap this. Oh wait, he probably has some canned tunes using the 03/04 Cobra ECUs with certain setups, so its less work for him to spend time tuning your car. Typical tuner bullshit. Sounds like those guys that con people with 94/95 5.0Ls to switch backwards to an A9L foxbody 5.0L computer.</blockquote>