I just checked my receipt from September 2010 when I had my plugs changed on the 2006 987S. I was charged 1.75 hours at $115/hour labor, so just over $200. Also had an oil change ($40 labor) done at the same time. Bought the 6 plugs (#999-170-223-90) from Sunset for $13.69 each. List price is $23.80.
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