[Perfectlap]

^ yep. I looked into myself so as to have my plan B options lined up should the engine expire.
Basically you have to look at it a little Differently. A GT3 transplant engine is not possible in the Boxster unless you spend more than actually buying a GT3. So if you want that level of power your either spending at least $17k for this conversion with a modest donor engine or you get one of those Raby engines. I don't think you can go wrong with either option if your stock engine went kaput and you wanted to keep the car on the road. Swapping in another Boxster or Carrera engine isn't really a performance game change.