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I agree with Un a water vapor injector vacuum powered is a good way to reduce NOx and knock which only happens when 50%+ power is needed. Many racer use water/alcohol units to make their 2k-4khp motors survive for a 1/4 mile. WW2 and aircraft racers use it too.
You can always have it tested, even buy your own tester as they are not that expensive. Then you can tune it out at a slight mileage decrease of a couple mpg if you want.
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