The JET Motors HV (HIGH VOLTAGE ) E-core design yields an incredible 60,000 volts and operates with no degradation throughout temperature ranges that surpass military specifications. The special heat sink design made from aircraft 6063 T5 aluminum efficiently transfers heat optimizing energy output for street / strip and off road applications. Flame-Thrower HV .45 ohm coils are also compatible with most capacitive discharge boxes including our own Second Strike.