Jay always offers the very best advice - there is no calmer, better 986 advice that you can find. But, to me its simple: replace the IMS/RMS and enjoy your car from that point forward. Peace of mind is worth a lot! Unless you are a top flight mechanic, with extra money, with all of the proper tools, lifts, etc., its a bad day if that engine blows - a real bad day.
Peace of mind is worth a lot!
Good luck,
David Preston
02 Boxster