OEM plugs seem to all be Iridium 5mm or something similar. Just stick with that. I ran OEM plugs in my WS6 (which was Iridium Finewire) and pulled one at 80K or so. It gapped out EXACTLY the same as OEM spec. I ran those OEM plugs until 149K when I sold the car, and it was still dead-even with the new SS's and the old C5 'vettes, etc. Never suffered a bit from it. Knocked down 27.5mpg on the highway doing 80.
Unless you are going FI, I would leave the OEM plugs in there for AT LEAST! 50K, and that's just if you're wierd and like blowing $10-15 a plug to replace them early for no good reason.
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