215k miles with banjo filter still in. Never had a problem, never got around to taking it out either. first turbo i swapped at 98k and the spool had a little shaft play but otherwise looked good. second turbo I swapped out with just over 111k on it and had more play and wouldn't have lasted another month on my commute.
head over here: http://legacygt.com/forums/showthrea...ight=long+haul
258k miles - Stock engine/minor suspension upgrades/original shocks/rear struts replaced at 222k/4 passenger side wheel bearings/3 clutches/1 radiator/3 turbos