thats totally up to you. If you're breaking traction in 3rd gear WOT, you can bet your ass it's been tuned. Imo, i would feel like shit buying a car and not knowing it was tuned. And it's quite possible that the dealer had no idea either (because the car hasn't had any repairs done in house)
and to answer your question, yes your car can be flagged for a modified ECU. Not good.
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