The heat exchanger for the water to cool down and it's going to go in front of the radiator. My understanding of the a/w intercooler is that I'll need a heat exchanger/radiator in the front, an A/W intercooler that goes from turbo to intake, pump, switch, etc. Yeah, I think it's going to be alot of work plus money but I think it's going to be about even with air to air since the good air to air cost big time money and all the plumbings. I won't need much plumbing done because I'm planning to put the intercooler right by the intake. It'll get better response since there will be less plumbing to go through.