My Mind is Numb over IMS

[Pastor T]

I am the 3rd owner of a 2000 Boxster, 2.7, 98k on car, 1st owner had engine replaced at 40k by Porsche due to "internal engine failure". "Reconditioned" engine installed. (engine # M962265Y15482) Do the math; 58k on the engine. The dealer cannot give me much more info than I have on the invoice due to it being in September 2003. From these dates and engine number can anyone tell me what kind of IMS I have. (Single, double, upgraded or what). As far as I can tell it has the orig clutch, PP, FW and throw out bearing. It is currently in my indy shop for noise related to TO bearing. I am having the C, PP, TO Bearing replaced today. I change my oil every 5k and do a complete inspection of my filter. I have not found a single speck in three changes. Last change I installed a magnetic drain plug. No chips only very fine metallic paste. My indy is NOT recommending changing the IMS since it is not showing any problems. I called Porsche, they said the same thing. I have read everything I can find and my my mind is numb. I am 64 years old, drive very aggressively, try to keep the revs above 3K and love my car. Any advice?