have just swapped my i/c on my 97 uk classic for a wrx 2003 one.
tried following the thread on here but my model has the idle control valve in the way so had to have pipe welded onto i/c for the dump valve to go on.
has made such a differance to the car.you can feel the differance from the inlet side of the i/c to the throttle body side.thought would put few picks up as fitting different from the one on the technical thread on here.
was bargain as well as £44 off ebay for the i/c,£20 for welding and £18 for new hoses.

spaced the i/c out further bout an inch so more room for dump valve pipe work.