Sonny, if you keep the water spray system to cool the exterior of the CAI piping, use either distilled H2O or water from a reverse osmosis filter. Distilled is mineral free, and RO water is really, really close to being mineral free. No minerals or metals=no hard water spots! "Purified drinking water" still has minerals, though it is most likely softer than SoCal tap agua.
This is a great idea, by the way. What kind of temp drops have you seen, or better yet, is it something you will keep?
AJ
This is a great idea, by the way. What kind of temp drops have you seen, or better yet, is it something you will keep?
AJ