Originally posted by Chris Hightower:
The Iridium line from Denso is somewhat of a gimmick, not unlike Splitfire. I am sure they are decent plugs and will make a decent spark on regular cars.
However, on the Contour which uses a "non-normal" coil pack, every other plug is fired "backwards". If you look at the way the electrons flow, and you understand "molecular migration" you will see why any kind of plug that is not double platinum WILL fail in the rear bank of the Duratec and two out of four plugs on the Zetec (not sure which cyls).
No, I have not personally seen an Iridium fail on a Contour, but I seem to remember someone posting a picture of one. That electrode is fairly thin, so I would think it would fail faster.
Try to prove me wrong and run your car with the Iridiums for 5000 miles. Then, compare the front ones with the back ones. Who knows, "Iridium" might be some kind of magic metal? 
Chris your comment is Intriguing and don't take it the wrong way when I say this but it's somewhat Uneducated!
How many Denso's have you personally dealt with? My supplier has dealt with 10's of 1000's of Denso Iridum Plugs and the only issue they found with them is people breaking the electrode by using the improper gapping tool or over torqueing the plug. When you got racer's, I'm talking at the track, Drag Racing, Road Racing ect. flocking in for these Iridiums and vouching for there success with them, might I add many of these tried NGK's line of Iridium when it came out since it was much cheaper, only to come back and say the Denso's are much better and went back to using the Denso Iridium. As far as Spark and size of electrode, the Platinums spark won't even match that of the Iridium in density and consistency and let me inform you and evryone reading this spread, 'The smaller the electrode the better!'....
Believe it or not....
Remember guy's this is the 21st century, the century we thought we would never see a FWD run a 8second pass, a computer go beyond 2ghz, Rally in the USA and a Turbo for the Contour, but guess what these things are all reality and so is Iridium. Never doubt Technology, it's the driving force of Society!!! Aloha, Micah
