Hypertech's Power Coil is capable of firing a street or slightly modified engine up to 7000 RPMs. Voltage gain over stock can exceed up to 57% more output depending on application. Stock coils usually average around 36,000 volts as compared to Hypertech's coil kits that average between 45,000 and 55,000. Our coil kits include coil, brass terminals, cap, and rotor. Nylon rotor hold-down screws are included to prevent misfire, and our caps are made of high dielectric material to prevent carbon tracking. Each cap fits the distributor housing tightly to eliminate leakage. Power Coil/Caps/Rotors are NOT legal for sale/use in CA.