It's not the "true" water injection (ghetto W/I). All I did and played with different setups. I took the rear washer line and got a spray nozzle and tapped into the CAI filter. The reasoning behind that was the mist would cool the intake temp. That worked to a degree then I took Doug's off comment advice about spraying the exterior housing with water and it working to cool off. So I rigged up the same nozzle to spray across the housing. I use regular water, like Sparkletts or Palomar mountain type. It works better than the filter type I tried. Only other thing is Nitrous. I can get an NOS kit and port if for dry for $550 installed. Or get the AquaMist and run water/alcohol injection for the same price and forget about the refills at an N2O station.