"It's Not about the $$ that matters"
"ONLY IRIDIUM SPARK PLUG TO TALK ABOUT"
Here's a list of iridium spark plug:
NGK, OWS, VOLKERS, DENSO, Nitro, etc... "You Name It"
Any Comments?
DENSO has to support it http://www.globaldenso.com/PLUG/power/structure.html
NGK has (looks Boring) http://www.ngksparkplugs.com/products/spark_plugs/iridiumix.asp?mode=nml