car still runs fine with over 30k miles on the swap. Boost spike at WOT due to serious leaks from the silicone intercooler hoses- took a long time to figure out but was easy to fix! Boost is not rock-solid going up hills using cruise control, but I don't have the patience to figure that one out.
Also have a small issue when driving in traffic and warm weather; the idle RPMS get higher with every stop and eventually reach near 3000 RPM when stopped at lights. Pulling the gas pedal up with my toe brings them down a bit (~1500 RPM). I've checked the throttle cable, have flushed the radiator fluid, and installed an Grimmspeed thermostat. Don't think it's a cooling issue, but have no idea what to look at next.
Nothing new to report, I've just done basic maintenance on the car and have no plans for any upgrades or changes.
Swapping in an 04 STI would be essentially the same, except you'd might run into complications with the rear axles, I think they differ for R160 and R180 rear diffs, but I've not thought about it for a long time.