Dyna® high tech, top quality coils are designed for maximum performance! They produce spark voltages in excess of 30,000 volts and spark energies second to none. They are made to replace stock coils in three configurations and five variations of resistance for different applications. These coils will work with point ignitions, aftermarket electronic ignitions or factory electronic ignitions. Before selecting a coil, check the coil primary resistance requirements as specified by the manufacturer of the ignition being used. They have no exposed laminations for rust to degrade performance. 1 year warranty.