I am at 86,000 miles in my 2000 2.7 and the only things I have replaced are Water Pump and Rear plastic window and 1 inner tie rod and a few light bulbs. Starter is starting to go bad, but still has at least 1 year left in it. My rough idle was fixed by cleaning the throttle body.
Thats it, as far as I know from previous maintenance records, everything else is original except brake pads, tires, and air filter.
I expect your Boxster to last a while without any major problems since you just fixed the problem areas. IMS does not happen to every engine. Get the "IMS Guardian" to be safe.
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