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Everything I have read about the 2.5L M96 engine that the boxster runs with seems to imply that you can do a top end rebuild but if you have cyl or piston issues you buy a new or used replacement engine.
The cyls have a LOKASIL liner in them that prevents any kind of bore or other refurbishment as that liner is very very thin. In fact, the '99MY boxsters with the slipped sleeve issues were on engines that Porsche themselves tried to rebuild due to their factory having a major production issue. These engines had upto a 50% failure rate even with the factory trying to replace these sleeves in their own manufacturing facilities. They also did some one piece casting work that makes replacing even the intermediate shaft more expensive then replacing the whole engine as they cast the bearings for it into the block directly in one piece. So, the new boxsters with the IMS failures all must have engine replacements as its too expensive to repair.
These engines were supposed to be throw aways if anything major happens to them.
GL!
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