04 here with 03 build date. I noticed on mine when i got it at 29k miles that from the bottom side of motor their was oil visible on valve covers. Took it into ford and they had some problems with the orings on the injector harness or something like that. Other than that, i have not had any problems except stuck turbo caused by excessive sitting from previous owner. If you get it and it has tons of insulation wrapped around the stock downpipe, get a dremel in there and cut the wire that holds it on the downpipe before you try to wrestle it out. I didnt know that tidbit when i did my system and it was a PITA. Im now at 45k miles and still no problems. Never puked a day in its life yet.
Doug