On the GTP cars it is hard to find a place after the supercharger to inject that will get all cylinders equally. That is the best argument for injecting before the rotors. It is possible to damage the rotors but the Aquamist nozzle makes a very fine spray. The biggest possible casue is letting the rotors get too hot then injecting water. If water starts before temperature get too high damage may be lessened.
In closing, injecting before the rotor has aways been a consern. I have two that come in to our shop that have had no rotor damage in 3 years.
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Brad
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