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The advantage that water/methanol injection gives to FI cars is a cooler intake charge that is less prone to detonation. This allows an aggressive tune without the fear of destroying the motor.
I'm not going to say there wouldn't be any advantage, but using it on a N/A car wouldn't be the best performance mod. There are some serious drawbacks to it too. You need to change your oil at real short intervals to keep the motor alive. Something in the neighborhood of as low as 500 miles to about a 1000 as the max.
Check with an engine builder before you do that. It might be better to trade your system for cash or parts that will provide a better performance bump.
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