Each module has a built in High Capacity Coil that will control and ignite one spark plug with a continuous arc. No need to use any external bulky automotive coils that leak oil. Powerful enough to jump a 1/4 inch gap with a continuous hot blue arc. Solid state electronic modules are waterproof with mounting ears on each end for easy installation. Small enough to hide anywhere. Dimensions are 2.5x1.5x1 inch.
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