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uh no. The type of plug is not changing the timing of the spark. Whatever you're quoting is marketing wank. Not to mention, a modern fuel injected car like the 986 very accurately controls the a/f ratio, so this WIDE RANGE would be between about 12.8 and 14.7, which pretty much any plain jane copper plug can ignite all day for 40k miles, especially at our given compression ratio.
Lets start with how are you measuring these temperatures so accurately?
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