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^ I would, because they can blame the DP for anything that happens with the turbo/engine. Which I think is BS because it let's the car exhaust better. As soon as they see it they will probably flag the car or make note of it for future reference.
For example. I had an subwoofer system in my old 08 335xi and they seen it and made a note on the receipt that unauthorized modifications were made to the battery and the head unit, and may cause problems in the future. They didn't flag it to BMW NA but kept it internal within their customer account system
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