holy bump from the skies.
i run BKR7EIX's and they run great. their longevity is much higher than any other plug i've run, and when you factor that in the cost outweighs usage of any other plug that i've used thus far. in comparison to NGK v-powers and NGK platinum's.
in regards to using 8 EIX's i wouldn't just jump to a higher different heat range so easily. you should monitor electrode heat wear after say 5000 miles to determine if you need to go one step colder. basically you look at the electrode for the color change point to determine if you need to go one step hotter or colder from your current plug. that is if you aren't having detonation issues, or blowing up plugs.
Here is a great article written by someone on Honda-Tech. It has very very useful information. I have not yet reviewed in detail for accuracy, but should provide anybody with enough knowledge to diagnose engine running condition themselves.
http://honda-tech.com/showthread.php?t=3063102
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