There are sets of Upgrade Clusters you can use to get everything upgraded to S-Class.

This is from an Outlaws era Reddit post on NMSCoordinateExchange.

I am on the fence about whether these sorts of things fit this community, since it’s really intended for individual discoveries. That, and the content is not really “searchable” on the title. Mmeaning, you can’t easily search titles to get upgrades, or review the list of post titles to find what you want…at least, not without making titles that are really long for something that is actually quite common.

It might make a good resources post overall, though, to point out systems with a large number of S-class upgrades. I’ll leave this post up for now while I figure out what to do.

Would you be willing to rename the title to start with “Resource/upgrades:”?