Suitable for MSD ignitions & constant energy ignition systems. If you are looking to upgrade your stock coil, 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! These windings are held secure and kept cool in an oil filled metal canister. The tower assembly is moulded from durable alkyd material due to its high dielectric characteristics while wide spaced brass primary terminals prevent the possibility of spark. There are several versions of the Blaster Coil available. All of them have the same internal specifications, but have different housings or components. In applications such as off-road, marine or other harsh conditions, the MSD Blaster High Vibration Coil is the best choice. The sturdy metal housing of the High Vibration Coil is completely sealed with a premium grade epoxy to completely encase the coil’s primary and secondary windings. This protects the coil’s internal components from high and low frequency vibrations that are commonly experienced in racing.