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with 2.5" inlets/outlets originally, or have them welded on. anything else is just asking for inefficiency. with 2.5 piping to stock sized inlets, you would create a nozzle, effectively a choke point in the system. the air would want to rush through the intercoolers to be diffused in the more relaxed area of 2.5 piping which awaits in the outlet piping, thus reducing the effectiveness of the heat exchangers. on the other hand, 2.5" inlets and outlets make sense as well (stock piping and larger intecoolers), so that the air diffuses into the intercooler, perhaps more efficient than most stock piping to stock inlet/outlet designs. i would like to see someone test 2.5" piping to the intercoolers with 2.5" inlets, then stock outlets and piping there after. this would increase back-pressure in the intercoolers and allow more heat transfer (assuming the turbos are flowing enough to create a state of back- pressure :p)....this is where i would like to create a choke point, where the heat exchange occurs.
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