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The main problem I see is the way you have the wrx intercooler routed.It´s not a smooth transition into the cooler.If you were to go with an air-air set up,then I think Wally´s set up is the best solution because there is fresh air flow to the cooler.Armin´s set up is inside the engine bay,but it is hard to determine if it is as effective as Wally´s because Armin injects water at around 1 bar boost.In Armin´s case,I believe it´s due to the cooler position rather than the cooler itself.Still as Wally correctly said,it is an effective cooler.Another thing to consider is if you are to go with a water-air cooler, then it would be wise to keep the water circuit seperate from the engine water circuit.
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