255 and 500 systems? Where?

[Wade]

I just purchased SE4. I've been reading many posts and have seen mentions of games with 255 systems and one of 500 systems. These must be mods because the "official" large quadrant size is about 100 systems.

Normally I'm only interested in "official" patches and expansions but more systems would be nice. I don't want a mod that alters the game AI/rules/mechanics.

Where can I get these mods that offer more systems ? They do not seem to be included in the deluxe edition mods. Do they alter the game AI/rules/mechanics? How does the "official" AI handle more systems?

-Wade