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 en Product Features:PerTronix 91544 Ignitor II Adaptive Dwell Control Prestolite distributor IBT-4101 U 10G 4 cyl Adaptive dwell maintains peak energy throughout the entire RPM range, reducing misfires while improving engine performance.
