water injection, won't Directly give you more HP, other then giving you cooler intake temps, but it allows you to adjust other things go get more HP, for instance water injection raised the octane rating to about race gas so you can advance your timing, because it keeps things cooler, also water injection will clean out your carbon build up, I run it on my supercharger setup and it works great!!! with no intercooler is see about 88 degree intake temps, and that is WOT @ 6psi with the throttle body running hot coolant through it!!!