It was a CG reward from back before I was playing the game. The class 5 size is now available from Human Technology brokers present in many stations. It costs you materials. Once unlocked, it's available in stored modules at the station and you can fit it to your ship. Felicity or Elvira can then add mass manager to it.
Unlocking requires the following Materials:
18 Datamined Wake Exceptions
26 Tellurium
26 Electrochemical Arrays
28 Chemical Processors
Okay, are they stackable with the Guardian FSD booster?Any Human Tech Broker will do...
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Frame Shift Drive
Device that allows super cruise travel and hyperspace jumps between star systems. — In-Game Description The Frame Shift Drive (FSD) is a revolutionary ship hyperdrive system manufactured by Sirius Corporation.[1] It was introduced to the market in 3297 after decades of secretive development, and...elite-dangerous.fandom.com
EDIT: Oops, ninja'd, but I blame the power blip that cause my PC to shut down...