The Dyna 2000 Digital Ignition System for Harley-Davidson Motorcycles, which has become the standard for performance and versatility in the Harley aftermarket, has been enhanced to include even more features. Including expanded advance curve functionality, vacuum advance compensation, and a special Retard Mode for use with turbocharged and nitrous bikes. The Dyna 2000 allows selection between four different advance curves and four independent rev limiter settings from 6000 to 7500 rpm. Dyna 2000 ignition modules use the stock factory pick-up and simply plug into the existing factory wiring harness on 1984-1990 model bikes. Not legal for use in California on pollution controlled vehicles - Check local laws before installing.