15,000 more than stock.
The MSD Blaster HVC coils do not include a ballast resistor. When you are using an MSD Ignition Control, the ignition is responsible for delivering the voltage to the coil, so a ballast resistor is not necessary. They put out 45,000 V, which are 15,000 more than stock. They also have an oil-filled metal canister and they fit stock mounting brackets.

Ignition Coil, Blaster HVC, E-Core, Square, Epoxy, Blue, 42,000 V, Each