This produces the impedance necessary to suppress radio interference throughout the entire frequency spectrum. When used in combination with resistor spark plugs, NGK resistor cables provide exceptional noise suppression without negatively affecting engine performance. A layer of ferrite magnetic material wrapped with variable pitch metal wire covers the fiberglass strand core. The outer jacket is made of one of two materials, depending upon the application. Ordinary solid carbon-core wires, used as original equipment on most Japanese vehicles, are not as efficient and effective.
Every set is tailored to the right cable length for the exact make and model specified.