what spark plugs to use for high speeds?

[SilverCL600]

Hey, I have a 1997 S/CL 600 v12 6.0l Today I went on Alldata to see what spark plugs I should use when I noticed Mercedes noted "use Bosch FR9DC plugs, Maximum allowable speed 100mph " I asked some people, why only 100mph? Their response was if you go over the specified speed with certain spark plugs you could burn a hole in the pistons. Don't want that for my m120 What type of plugs should I use if I want to go over 100mph? Florida Alt : Sea Level Temp : 70 - 95 Humidity : 10,000% (you'd believe it if you work outside in the Floridian summers) Thanks for any input

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