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Super easy for engineers to to tell when we're running JB4 on the B58, fuel trims are through the roof under the higher end of the factory boost range.
Also they could monitor value PID requests throught the OBD port, pretty easy to tell the difference between an insurance safe driving dongle always requesting speed or throttle position, vs a jb4 always requesting Low pressure fuel, timing values on each cylinder, Fuel trims, gear.. the list goes on its pretty obvious and easy for them, if they care.
So far they haven't care much.
All this data would be in the FASTA files which dealers cant open and is collected every time the vehicle is connected at the dealer.
Some may be right about the dealers not always scanning via the OBD port because fault codes are stored on the key, so they wouldn't really need to unless they had to run a testplan, program or investigate a concern.
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