NGK Part Number, anyone know?
Here are the normal heat range plugs for the xB:

For one heat range colder change the "5" to a "6" in the designation.
REF: http://www.ngksparkplugs.com/tech_su...2.asp?mode=nml
Hope that helps.
Tom

For one heat range colder change the "5" to a "6" in the designation.
REF: http://www.ngksparkplugs.com/tech_su...2.asp?mode=nml
Hope that helps.
Tom
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