Dynatek Twin Fire Coil DC6-4Design incorporates two individual performance ignition coils into a single, easy to mount package that is only slightly larger than the stock coil and uses the stock mounting bracket Delivers spark voltage in excess of 30,000V with fast rise times and high energy For all single fire, dual plug head applications Can be used with any electronic advance ignition system that incorporates dwell control, but cannot be used with the DS6 2 Dyna S or similar