Correct me if I'm wrong here xrt, but I think he was referring to external water spray onto the surface of the intercooler and not injection, ETM. It's a good idea, in theory, if you have high ambient temps and a not too efficient intercooler. The only downside is you will use lots of water and you'll need to sort out spray head flow rates for maximum effect without just pouring water everywhere. Also, a large capacity tank is normally required as a washer bottle isn't very large in capacity and won't last long. Good luck if you decide to do it and post up some pics of the end result.