I ended up getting a set of NGK iridium plugs for my 2000 Boxster as the default plug that came up from an online parts supplier... after reading a bunch of forums, I couldn't find any good information on people using them, and a few negative comments online so I ended up just going back and getting factory copper plugs. I'd guess they work fine, but it's sort of an experiment, as there doesn't seem to be a lot of reports about them on the forums, and they aren't what the cars came with new.
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