I have heard that some parameters of the DSG including the torque limiter / manager can be modified with an ECU tune, but that wouldn't change the fact that a stock DSG is limited / managed /whatever you want to call it, to 350Nm, so I wouldn't call it a myth - the limit, like many other software limits on a car, can be modified, that is all. Through a DSG tune it is claimed that by properly tuning the gearbox the torque limit is raised "safely" because the gearbox is properly calibrated to handle the extra torque. Arguably it's quite possible that for a stage 1 tune, ECU modification of the torque manager without modifying the DSG map is sufficient, but that's a decision the buyer would have to make unless you can show some evidence.
Bottom line, stock gearbox = 350Nm limit, APR tune can get around the limit but not modify the DSG map itself, with a proper DSG map it would cost more but arguably be done "properly". I understand manufacturers employ conservative limits, but if the DSG is rated at 350Nm I wouldn't go around trying to force 500Nm on it without making sure the gearbox is tuned to handle it.
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