Old post or not the new guy's love the read, myself being one of them. I just bought the NGK Iridium IX from Napa. They have a 0.06mm center electrodes Denso's are 0.04mm. Right now Denso, Champion and NGK are the best performance plugs on the market. Autolites has put out a so called enhanced iridium plug but the content of iriduim is soo low you can't really call it an iridium plug.
Bosch makes an iridium plug under HKS Super Fire Racing which are a serious racing plug but don't know much about them other than they also have a 0.04mm center as Denso. NGK makes another iridium under Blitz that are 0.06 Though the plugs start at 25$ a piece from what i gather. Though i dont think either make specific plugs for the SVT, CONTOUR OR MYSTIQUE.The do it yourself'ers may find it interesting though.
I settled with the NGK Iridium IX and not the Denso for two reason's, Cost and their noted recommendations specs: NGK plugs are specially made for the Duratec.Plus they are fine wire Other than that i would have gone with the Denso's which are ultra fine wire. Champion's are a 0.07 with a iridium center THOUGH has a platinum tip.
I figure save a few bucks and hold on to ol' faithful NGK, which i run on all my motorcycles.
