just to clairify.
the 2006 2.5i has 1 fuel line as it is a returnless fuel system. the regulator and return line are in the tank. the second line in the engine bay is an evap line.
the wrx has a return style fuel system, and its fuel regulator is on the fuel rail.
when i swapped a 1992 eg33 into my 2006 2.5i, i ran my own return line and used a t-fitting on the jet pump line to the main pump. then plugged the intank regulator