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I bought this Spearco Water Injection kit in the mid-90s with plans of installing it on my RX-7.  However plans fell through and I never got around to installing it, so it has sat in a box for about 15 years until I just discovered it while unpacking a couple weeks ago.  The kit is missing a few odd screws and vacuum lines but the major components are there: .4 gallon resevoir tank, electric water pump motor, boost-activated adjustable valve.  

What does water-injection do for your car?  Well, for turbo/supercharged or high compression motors, it adds a "buffer" to the combustion event which can reduce or eliminate detonation and pre-ignition.  It allows you to run full timing and boost without fear of breaking something.

This is the old style hand-welded aluminum version before they went to cheap plastic.  Very durable and hard to find.  New Spearco water injection kits are $400-500, but I'm looking for $160 in BTC for this one, shipped within the US.

https://i.imgur.com/bQj2y.jpg?1

will this fit any car ?

Essentially. You'd just need to adapt how it fits to your intake system.

Yes, it's a universal kit (though it's probably unnecessary if you don't have high compression or forced induction).  Basically you pick a spot to locate it and run some wires to power the motor, and vacuum lines to your intake, and some water lines to spray back into the intake.  Here's what all you'll need in addition:

- Extra wire to power the electric water pump (it comes with short wires, as pictured, but you'll probably want some to pick up some extra wire so you can mount it where you want)
- Vacuum lines to both sense manifold pressure and to supply water to the intake.
- Atomizer nozzle