The important thing to remember with a front mount is not the power benefits but the reliability benefits, especially where Imprezas are involved. Bare in mind that although a top mount intercooler works and fits the flat 4 engine nicely, getting air in that scoop and cooling the intake air has always been something Subaru has continually tried to develop and with good reason.
I think I was once told that at over 70/80 mph the scoops on the classics up to the hawk eye's are struggling to funnel a good feed of air through the intercooler (have you noticed how big and re-designed the scoobs turned out on the hatch's and newer...!). A few big pulls on the autobahn at high speed in higher gears and Scotty can tell you the rest...
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