TRD Ignition Lead Kit - 7mm - Corolla AE86The spark plug lead must reliably transmit the high voltage from the ignition coil so that the spark plug can reliably send a spark across its gap. Discontinued, last set remaining The TRD spark plug lead sets for the Corolla AE86 were developed based on the racing use concept. That is, achieve ideal resistance to enable a strong, steady spark, even under harsh conditions. We also used silicon rubber, with its excellent heat and water resistance