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The Dyna S is a complete self-contained electronic ignition system built with the latest state-of-the-art engineering. Made in the USA. This is the same ignition used by top drag and road racers to win numerous victories and set records over the past decade. The Dyna S is completely housed behind the ignition cover and uses a magnetic rotor with the original spark advancer, so the factory advance curve is maintained. The venerable Dyna S ignition is a time proven solution to the basic ignition and trigger needs of the modern race bike. As a stand alone ignition or as a trigger for the Dyna 4000 Pro ignition, the Dyna S is the standard of performance and reliability.