This it the ignition system, my father designed and built for my SJ413. The plans for a coil on plug ignition system for my SJ413 were set forth by the time I bought the vehicle. The real planning and design work began in the winter of 09. The required parts were aquired over a long period of time and the design was done with care. The advantages of the system is that it is water tight and enables the engine to run smoother.