Those with the most experience and who readily work with various water injection setups are on a lot of GN forums. We have tried to get some to come over here but most of them already know what they need to. Though there are many on this board with DIY experience who I am sure will chime in.
Things to keep in mind:
Quality pump with sufficient pressure and flow specs.
Jets/nozzles that provide good atomization at the net pressures achieved.
Diagnostics - even simple LEDs to let you know things are on when they are supposed to be is better than nothing and blind faith. No budget can afford to bypass making sure a knock suppressing system is working as intended.
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