It incorporates a ceramic resistor to suppress ignition noise generated during sparking.
Resistor spark plugs prevent electrical interference that can disrupt car radio reception, two-way radio and cellular phone operation.
This type of spark plug also prevents electrical noise from interfering with the operation of the computer in the engine.
As the resistor spark plug has an incorporated resistor, some people think that it has adverse effects on start-up, acceleration, fuel economy and emissions. However, this is wrong. It does not affect engine performance so don't hesitate to use it.