The DYNA "S" is a complete contained ignition system. Housed behind the ignition covers and uses a magnetic rotor with the original spark advancer, so the factory advance curve is maintained. Complete electronic ignition systems built with the latest state-of-the-art engineering. The same ignition used by top drag and road racers to set records and bring home victories over the past decade. The Dyna S is completely housed behind the ignition cover and uses a magnetic rotor with the original advance unit, so the factory advance curve is maintained. Coils provide spark ...