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I have dynoed a supercharged M3 a couple times that runs water injection. With it off or on the power is the same. The power curve with it off is very jagged and looks like the car is knocking, with the water injection turned on it is exactly the same. He can't turn up the boost easily like you can on a turbo car when the water injection is running, but it looks like crap no matter what anyways.
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