You don't have to do the PCM with the FICM, it just depends on if you want the factory tow/haul back, or the pilot injection for a quiet idle back. Of course a non SCT tuned 03 with the org PCM programming will run and have more power than a non SCT tuned 03 with the latest ford flash. But with your custom tunes IMHO, I'm not sure you'd really benefit in terms of total power output by going back with the PCM. The FICM is a whole other matter. Perhaps Cody or Bill will comment on this?
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