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S&S Cycle IST ignition system consists of durable components for riders who want maximum coil output from their bikes. This means you will be able to get more torque and horsepower from the bike. The Intelligent Spark Technology (IST) is also important to the bike as it helps prevent engine damages that may be caused by knocking or detonation. These products are attractive to most riders as they install easily and quickly without the need to perform permanent modifications to the original harness of the bike. The system has a rev limiter that can be lowered or raised to an optimum level of 3200 rpm. This prevents over revving that may damage the balancers.