Prejoran Power-Diffuser, Defense +50, size 10 are a relatively energy intensive module to get (going through all the missions) and by the time you get it, you probably wouldn't put these on your ship, because you've already gotten better.
I would request because these are a mission blueprint item, they are allowed to stack with other dampeners we already have. They don't give a huge bonus but we did spend time and effort to get them, it would be nice to keep them. Plus, since our access to Prejoran tech is limited, this isn't something we can scrap and re-buy easily.