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There is no warranty safe option. If you tune they will know for warranty purposes.
With the limited production of this car, and the fact that the car gets 'normal' S55 output anyways - I'm not sure it would be wise modifying much when it comes to the engine. It's just not worth it.
At most i'd maybe upgrade the intercooler & associated radiator in a way that could be reverted back to stock if needed. This way you are at least letting the car make more power under heatsoaked conditions. Although I think BMW already did a good job with this.
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