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I voted air 2 air.
Regardless of which path you choose, you'll need to fit all of the components based on your packaging restraints.
Wally's solution obviously works for him, and the results cannot be disputed. He has published the temp deltas for all to see, so you can come to your own conclusions.
My old air to water system worked great ( pwr 4" barrel ) and I could get the intake temps to below ambient with ice, but that only lasted about 30 mins on the street. When parked outside during the afternoon, I had intake temps above ambient because of heat soak, and the water took some time to cool while driving.
Imagine sitting under the sun at a show all afternoon, and then hitting the highway on the way home, trying to battle a tuned Jetta, and wondering why the engine does not feel strong.
I've got temp data from my air / water system, but Wallys solution is better overall at keeping temps in check, from data that he has freely provided.
Sandeep
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