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Not sure if it's true or not so take this with a grain of salt...
I've heard from a few people they don't even bother to read the tunes anymore. They have a "flash" counter in the PCM and if the number of flashes doesn't match service records, they can deny a warranty claim.
So for instance, if you bought the GM CAI and had them flash/write a tune on for it, if you came back with anymore than 1 flash, they can deny you.
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