Wow, I'm glad this thread caught my attention. I've been designing my own air-water aftercooler in AutoCAD for a bit now. The only downside I can see is if any part of the core breaks you can kiss your engine goodbye when you come off of boost. Ever see the bottom end of a motor that's taken in water? The rods look like pretzels, wrist pins poke through the piston domes, etc... Any dyno results? Or did I miss 'em. (Old laptop, small display, old eyes.)