Technically it probably is a warranty issue. I inderstand that the module modifies the ECU on the fly and does not exceed the VW maximum engine performance. VW set the ECU out of the factory at a lower than 100 %. If you are flogging the car then you will probably blow something even if you do not have a chip. Some modules can not be seen by the dealer computers so unles they spot it in the engine bay they do not know.
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