DC9-1 Two Dyna Coils with Dual outputs. Primary resistance is 0.7 ohms and secondary resistance is 11,500 ohms. These 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. DYNA Coils are made to replace stock coils. Choose from three configurations and five variations of resistance for different applications. DYNA Coils work with point ignitions, aftermarket electronic ignitions and factory electronic ignitions. Before selecting a coil, check the coil primary resistance requirements as specified by the manufacturer of the ignition being used.