I am using the CR08GS, in my HP4, I like them. I pull them out a couple of times a year an check them. I run 3-4 different types of race fuel from Sunnco GT 100 to VP MR-12. They seem to perform well, I have less than 2000 miles on them, as this bike is used primarily for Land Speed racing. I have spoken to several of there Tech guys, before we decided on this particular model of plug. So it's based on fuel, WOT, for 3-6 miles and how they work with the Sprint air filter, an my PCV. If there is something the is really a step up I am not aware of it. Then factor in switching plugs is a pain, having to pop the fuel tank every time to swap them out.
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