Accel HEI Super Coil For Harley Features: Designed to produce the maximum amount of spark energy, fast coil rise times and a voltage output that is 45 higher than the OEM coil Easily installed in the OEM location using stock mounting hardware Bolt on to achieve smoother idling, crisper throttle response and quick acceleration Finned design acts as a voltage dam to prevent arching, carbon-tracking and flash-over Single or Dual Fire Dual-Fire 2.3 Ohms / Single-Fire 3.0 Ohms