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.