Capacitive discharge ignition system for 4, 6 or 8 cylinder motors; provides multiple spark for improved ignition and includes an adjustable rev-limiter for maximum protection. Perfect for street/strip vehicles; The ACCEL SuperBox is one of the best ignition values on the market, a perfect blend of value and performance. the ACCEL SuperBox Capacitive Discharge Ignition System is the perfect upgrade. When the engine is running at low rpm, this modern capacitive-discharge ignition fires a series of multiple sparks that last for 20 degrees of crankshaft rotation, ensuring better combustion of the air/fuel mixture and creating instant throttle response and a smoother idle.