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The originals for the 2003-2007 have been superseded by the 41-110...
From a GM Parts Service bulletin.... (it includes 2003-2007 Hummer H2 as well as most every other GM with a V8 engine from 1999-2007)
PARTS INFORMATION: A New Spark Plug has been released for use in the above vehicles. The New Spark Plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The New Spark Plug, A/C Delco Iridium Part Number 41-110, is Gapped to 1.01mm (0.040 inches) when the Spark Plug is made. The Spark Plug Gap is set during Manufacturing and should Not be Changed to the Gap required with the Platinum plug, or Damage to the Spark Plug may result."
Hi Ted - no this is current topic but no a supercharger not something I've done yet. I really want to though but finding the time and of course the wife factor will come into play. I was thinking this might be a good approach.
much valuble information. thanks Mix. ordering my 41-110s on ebay asap
your like the third person that mentioned duramax. a lot of work & hustle for that one. definetly going in that hole just not that deep not yet anyway. money has a funny way of magickly apearing when you really want something. for now starting with the basics & im gunna have fun doing it
That my friend is what it is all about. Having fun
You can do a lot to your stock motor to increase it's performance and even efficiency...
I was thinking this might be a good approach. 
