[ermax]

Plugs are on the side of the engine and can actually be changed without raising the engine. I suspect you could find a shop that is used to working on boxers (with the exception of Toyota or Subaru who will base the labor cost off the service manual which calls for raising the engine) that knows how to do it without raising the engine that would do it for less. I pulled one of my plugs at 85k or so just to see how they looked and decided they were fine. Took about 15mins to remove and put it back in. You just need small hands and the right sized extension (real stubby one).