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It goes without saying that any time you modify the car, your factory warranty (at least for that part) goes into the dumps. As per the TTRS owner says, it seems highly unlikely that such a serious engine problem is in any way related to the ECU tune. Still, the rules of the game are laid out quite clearly -- if you fiddle with that ECU tune, you void your engine warranty.
In the OP's case, the factory engine warranty on the car is already long gone, so any potential warranty concern is irrelevant.
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