Yes, the dealer can detect your tuned PCM
#35
NBS trucks had the mileage in the cluster. I haven't had any mileage issues with a NNBS yet but ECM programming makes no mention of mileage so I'll have to assume it's in the BCM or cluster.
#40
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There is some current info on this subject on page 3 and 4 of this thread
https://www.performancetrucks.net/fo...d.php?t=479562
https://www.performancetrucks.net/fo...d.php?t=479562