Coils have always had to compromise voltage output against current output. More voltage increases the initial ionization of the spark plug gap, but lowers the amount of current, or heat, that follows across the plug gap. When a coil is designed to produce more current, the voltage output generally suffers which taxes the ease of ionizing the gap. The MSD HVC Coils are designed to produce maximum voltage and energy! To accomplish this combination of high voltage and current MSD uses an E-core winding design. This is a very efficient design where less loss occurs during the transfer of electricity due to the closed core of the coil. Another benefit is that the coils run extremely cool, even at high racing rpm, thanks to the efficient design and huge laminations. Features: Designed for racing applications with an MSD 7 Series Ignition ControlEfficient E-core winding design produces more voltage and current85: 1 turns ratio and lower primary resistance produce high voltage outputWindings are encased in red epoxy and secured with extruded bracketsSpark plug style terminal and threaded brass primary studsSupplied with rubber shock mountsNo CARB Exemption Order NumberPit Stop USA offers MSD Pro Power HVC Ignition Coil 8251 at low everyday prices. Be sure to check out all of our products from MSD including MSD Ignition Coils.