NGK Spark Plugs are designed to OEM requirements and as such, a variant of each of the above styles may not be available as it may not be an OEM requirement. RESISTOR TYPE SPARK PLUGS INCORPORATE AN INTERNAL RESISTOR TO SUPPRESS IGNITION NOISE GENERATED DURING SPARKING. THE IGNITION NOISE WHICH IS OFTEN KNOWN AS EITHER ELECTROMAGNETIC INTERFERENCE (EMI) OR RADIO FREQUENCY INTERFERENCE (RFI) CAN DISRUPT ELECTRONIC COMMUNICATION SIGNALS, EFFECTING THE PERFORMANCE OF SOUND SYSTEMS, CELLULAR PHONES, TWO-WAY RADIOS AND EVEN ENGINE MANAGEMENT SYSTEMS. Features Centre Electrode: Nickel Ground Electrode: Nickel Service Life **: 20,000 – 40,000km **Please note that the service life is provided as a general guide and may vary due to vehicle driving conditions.
