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The dealer can't tell you have a remap by using a computer. He can only tell when he takes it for a test drive and it's pretty obvious then!
I would advise staying away from tuning boxes. At best, they fool the ECU that a certain signal is wrong, and the ECU tries to compensate. As a result the ECU is not seeing real data, and you lose all the protections it offers against overboost and overfuelling.
Best thing is just to either remap, or enjoy the car as standard.
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