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Tuners squeez out the most they can from the car, thus increasing more hp and torques like they claim. This pushes the engine and its compartments to its limit. That is why if you get ecu tuned, your oem plastic chargepipe blows because it cannot handle the high pressure etc. Increased hp and torque to your car will wear your car internally even faster; which would explain increased number in warranty claims. There is a good reason why BMW will likely deny your warranty for tuning.
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