The Blaster coil range from MSD ignition are ideal if you are looking to upgrade your stock coil, or want to compliment the performance of your MSD Blaster 6 Ignition, the Blaster Coil line is the right choice. All of the Blaster Coils are designed for improved spark output. Special 100:1 windings are used to provide maximum build up of voltage and are held secure and kept cool in an oil filled metal canister.Two models of Blaster coil are available -Without Ballast Resistor - For use with MSD 6 ignition modules or for vehicles with electronic ignition which do not require a ballast resistor to be fitted.With Ballast resistor - For use with contact breaker (points) triggered ignition systems or electronic ignition which require a ballast resistor to be fitted. These coils are also supplied with terminals and rubber plug lead boot boot to suit most applications. Specifications:Inductance: 8 mHMaximum voltage: 45,000 vPeak current: 140 mAPrimary resistance: 0.7 OHMsSecondary resistance: