The AEM high output inductive coil is a “dumb coil” designed to be used with an igniter. This coil offers the high spark energy and voltage typical of a CDI ignition system, but delivers a long spark duration that can only be achieved using inductive coils. The coil itself is constructed to operate in harsh environments and is shock and weatherproof, allowing it to be mounted virtually anywhere. These coils deliver a powerful, long duration spark and are ideal for use in high-boost or high compression engines. Before installing the AEM High Output Coil, disconnect the battery cables. Improper handling may cause severe electric shock which may result in injury or death. The unit must be completely powered down when any electrical work is performed on the vehicle. Improper installation and/or adjustment of this product can result in major engine damage. AEM holds no responsibility for any engine damage that results from the misuse of this product. Legal in California only, for racing vehicles which may never be used upon a highway.