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You guys are correct about ignition angle, different OEMs refer to it differently and I had forgotten this is what the variable is called in Durametric. You should also check the Camshaft Position Deviations, which is effectively the angular deviation from what the vane cell adjustor is supposed to be advancing or retarding the timing. Generally the timing is locked in the fully retarded position to start and then is advanced by the DME using oil pressure and a solenoid. A PIWIS can tell if the car has been tuned but there is no way that I know of in Durametric. If Durametric has a field for the number of times the ECU has been flashed as some do, this could be an indicator. If it was tuned, Porsche or the tuner should be able to set it back to stock. For your question about o2 sensors, are you looking at the precat or postcat value? The post cat value should not "follow" the precat value. For my naturally aspirated 996 here is an old thread of mine with relevant notes, I would think it should apply to the turbo as well overall: Going back and reading that thread of what I did 10 years ago is pretty funny... I never would buy the O2 sensors on Amazon now like I did back then. I am wiser now... but also older 😉1 point