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FYI your warm air intake doesn't lean anything out. Your O2 sensor corrects the less dense air with less fuel so you retain a stoichiometric air/fuel ratio.
That being said, when I was looking into water injection (a while back, not sure it has much merit anymore to be honest), I wanted to use a fuel injector to atomize the water as much as possible. You could easily tap into an existing fuel injector signal to meter your fuel very precisely according to the amount of fuel the engine is using. Most commercial kits are crap imo.
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