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Mine is a stage 1. You open the plastic case and there is a dial in both boxes.
I dont think there is a stage 2 for n63tu (2014+ 550i) is it?
My warranty is with BMW the car is only 6mo old. Not issues. In fact, (I know I should nof had done it but I didn't know) i asked in a bmw dealer and they said unless we can proof the problem was because of the JB4 it should not affect the warranty.
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