[88carrera]

I changed my 996 plugs at 40K miles. I think the factory schedule is at 50K or 60K miles, I don't remember. I don't know about the Boxster, but on the 996 the mufflers/brackets are in the way for a couple of the plugs and this makes it more difficult than one would like. Not insurmountable, but a pain requiring small hands and articulated wrenches, if available.

I would imagine that the 996 is generally easier to work on engine accessories than the Boxster as the engine is not buried and not so inaccessible from the top.