Accel SuperBox Capacitive Discharge Ignition System 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. It can be set for 4/6/8-cylinder applications, and easily connects to points, amplifiers, and magnetic-pickup distributors. An adjustable rev-limiter protects the engine in the event of driveline failure or missed shift. It's fully adjustable with rotary dials in 100-rpm increments.