floridabill is the guy who had a 2000 Boxster S with 329k (more by now, hopefully) miles a year ago.
he said that other than regular maintenance, the only things he's done were replace the water pump twice and an engine mount.
and yeah he's the guy who said:
"I have no idea what an IMSB is…is this something I need to be aware of?"
http://986forum.com/forums/general-discussions/36191-question%85boxster-s-329-000-miles.html