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MSD DIS-4 PLUS DISTRIBUTORLESS 4 CHANNEL IGNITION CONTROL -- 105-115 mJ per spark, 460-480 V primary voltage, 40,000 V secondary voltage, 20 degree crankshaft rotation spark series duration, 14,000 rpm with 14.4 V rpm range, 10-18 V negative ground voltage required, 6.6 amps at 10,000 rpm current draw, 4.5 lbs. weight, 9.5 x 4.5 x 2.2 in. size; Capable of firing up to four coil packs; Delivers full power capacitive discharge sparks from idle through racing rpm; Provides easier and more precise adjustments of the overrev limiter and the holeshot rev limit.