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You must use a resistor plug with the DIC as far as I know. Other than that, anything fancier than copper is a waste of money unless you are heavily tuning your setup with more boost, larger turbo, etc. The "colder steps" have to do with the profile of the ground strap, electrode and how much ceramic is exposed into the combustion chamber. The more hot material that is physically inside the mixture charge, the more likely it is to ignite out-of-timing( without spark ). This is called detonation and is the main reason engines fail. If all of the valves are closed when it happens, that gas is going to find a way out. Usually by forcing the piston down against its will or pushing the head up and ripping the head gasket.
 
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