Resistor
At the moment the spark jumps the gap it causes a high frequency burst of energy, this is known as RFI (radio frequency interference). This is why resistor spark plugs were introduces in the mid 1960's. Placing a resistor within the spark plug suppresses the RFI. Without resistor plugs in your car you can experience static on your radio as well as interfere with other sensitive electronic equipment. Some later model vehicles as well as newer Powersport engines must use resistor plugs for a proper "talkback" to the electronic ignition.
For automotive CDI high output ignition systems (such as Mallory, MSD, Crane and Accel), refer to "Resistor plugs for race engines" in the ADVANCED TUNES section of this website for information relative to modified motors.
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