what would be the point of a rear mounted intercooler,surely the front of the car is the coldest place on it as that gets the new cold air first,,the only reason for rear mounted rads is the lack of new cold air due to it passing through the larger front mount intercooler. move it to the back in a sealed unit and have the air drawn up from under the car(or rear windows,roof) and out the boot or tailgate.

thats what i think anyway.