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Have you tested that theory (by gapping your plugs, and then re-checking the gap 1,2, or 3 years later)? I think you'd be surprised by how little, if any, they changed.
I can't speak for the Boxster because I haven't checked, but I pull the plugs from my lawn mower and snowblower every year and the gap is always still bang-on .030"
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'99 black 986
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