The energy used by the ignition system of your Nissan D21 Pickup comes from the battery. However, the energy derived from the battery is not enough to create a spark. This small amount of energy has to be boosted. Good thing there is an ignition coil. The ignition coil boosts the energy into a larger amount, enough to create a spark. How does the transmission of energy become possible? The energy transmission is made possible by the highly resistant Nissan D21 Pickup Ignition Wires. The ignition wires are not ordinary wires. They are made from a special material to endure large amounts of energy which conventional wires are not capable of handling. The resistance of the ignition wires ensures adequate flow of energy. But in time, ignition wires degenerate. If this happens, you need to think twice and seek for replacements right away. In the case of your 1997 Nissan D21 Pickup, the appropriate ignition wire replacement is the NGK Ignition Wire Set NX93 NGK. The NX93 NGK ignition wire set is set to the standard of your Nissan D21 Pickup, so you are assured that it will not jeopardize the performance of the ignition system. With the F1020-115950 NGK Ignition Wire Set NX93 NGK, you do not have to acquire the wires separately but in a complete set. Visit our website for a wide supply of the NGK Ignition Wire Set NX93 NGK. We have a complete catalog of auto parts that will help you with your replacement and upgrade needs.