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"We replaced your missing escape pods. Upgraded the tractor beam generator to a Mark Seven, and the hyperdrive motivator to a Series Four-oh-one—"
"Holy mother of meteors."
―A New Republic yard boss and Han Solo[1]

The Series 401 hyperdrive motivator was the primary hyperspace propulsion system of the Millennium Falcon following its upgrade from a Isu-Sim SSP05 hyperdrive generator.

This was considered to be a "more efficient" unit, but apparently had the same Hyperdrive Rating of 0.5 as the heavily-modified SSP05 (though it is technically possible that the drives were merely swapped back to restore the Falcon's previous 0.5 rating by the end of the Black Fleet Crisis).[2]

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