I too am curious about this. My Viper technician that works on my truck here in nc stated that the best plugs to use are the factory champions. He stated that the viper motor was created with them and tested with them. He is one of the officials for the viper racing circuit. I figure he works on them everyday and then races/tests them every weekend, he should know what he is talking about.
That being said, I am curious about what others use in their trucks and how they perform.