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This MSD 6AL capacitive-discharge ignition works differently than the inductive-style. Inside the box is a capacitor that becomes charged with 460 to 480 volts and then stores this current. When the ignition is triggered the required electricity is always at hand and the possibility of a weak spark at higher rpm is eliminated. The result is that top end power is enhanced because every combustion cycle receives a full jolt, regardless of engine rpm.