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What comes from the factory and are you guys still under warrenty?
Do you think different plugs (especially heat range) would void your warrenty?
My '05 has the 100,000 powertrain warrenty, I have 19K on it so I am a little cautious.
swapping out the plugs wont void the warrenty. if you start messing the the pcm like i did with custom flashes and stuff then it will. any bolt on will not void warrenty even nitrous. but make sure you remove the entire kit before going to the service dept
OK, so if a colder plug causes the PCM to richen up, carboning up the heads and a chunk of carbon sticks a valve open they can say the colder plugs contributed to it!?