Audi 2.7tt swap sounds like a horrible idea...
I LOVE IT!!!
For the OBD connector, the plan is to run the GM Class-2 (J1850) wire to the Porsche OBD connector in the driver foot well. I currently have a completely independent and separate OBD connector in the trunk for the the GM ECU. I'm pretty sure the J1850 wire is on a different pin that what the Porsche uses. If I can't pop an additional pin in the Porsche connector, I'll just re-wire a entire new connector that I have laying around at work.
Once this is complete, any diagnostic scanner would work the same as it would in any other car. They'll even be able to toggle the engine light to verify you didn't just yank the bulb.
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