To make sure you reset the P1000 code (I/M readiness code), you should probably set back to stock several days before you visit the dealer. How many days before depends on on how much you drive each day. Basically you have to complete the Ford Driving Cycle.
IIRC, the Gryphon can always read the DTCs (even if your tuned to stock), so it's easy to check if the code is still present.
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"Good judgement comes from experience. Experience comes from bad judgement." - Colin Powell to new batch of 2LTs (while serving as V Corps Commander)
Factory manuals here: http://www.motorcraftservice.com
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