The Ignitor II has many of the same great features that the Ignitor has, but its smarter. Ignitor II units sense the coil current level and use a powerful micro controller to adjust the dwell. Variable dwell helps to maintain peak energy throughout the entire rpm range. Ignitor II systems develop up to 4 times more energy between 3000 and 5000 rpm than standard ignition systems. High rpm performance is improved when used with the Flame-thrower II super low resistance (0.6 ohms) 45,000 volt coils.