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I have a bm3 tune with catless downpipes and extended warranty. I flash the car back to stock prior to taking it in for warranty stuff and it wasn't detected the first 2 times. The 3rd time when the warranty company requested data, the dealer pulled the 0777 code. Although I have a decent relationship with the dealership, my sa, and the foreman, they can look the other way only so many times.
You have to decide what your priorities are.
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