I guess I'll rain on the parade by saying it's another subsystem that can break, leak, or run out of fluid at the worst time. Keep in mind where it's going to go, as the tank needs to be at least several gallons in order to last. I switched to a
much larger intercooler as well, cooling the intake charge without need for water injection. Lastly, some people add methanol to the water to increase the heat-absorption, but it's highly poisonous and who knows what inhaling the fumes is doing. I ended up converting to a flex-fuel setup and now run E85 anytime high boost will be run, current power on 91-octane is ~330whp and around ~430 on E85.
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Midlana book: Build this mid-engine Locost!,
http://midlana.com/stuff/book/Kimini book: Designing mid-engine cars using FWD drivetrains
Both available from
https://www.lulu.com/