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NGK 6097 copper spark plugs in his knowledge base article but i cant find these easily, and the ones i do seem silly cheap for performance plugs?? how many miles should you expect from standard plugs compared to cold grades?*E are just plain copper V groove. Mine seem to be fine after a few thousand miles, but if you want longer life I suspect you'll need to fork out for the Platinums, which are the OE plug (note: they don't seem to do them at grade 7)(platinums already gapped). for the engine they will foul up. I would think raised boost would be where a colder plug would be useful to keep cylinder temps down.