In many performance applications such as off-road, drag race, marine and oval track racing, strong vibration forces can be transmitted through the chassis to the MSD unit. To protect the MSD from excessive vibration, we recommend the use of these vibration mounts. MSD offers three types of vibration mounts, one for the MSD 5 and 6 ignitions, one for the MSD 7, 8 and 10 series, and one for the pro power coil.