Replace mufflers only, or worth it to go full system?

I’ve been kicking around changing the exhaust on my '04 Nogaro S4 6 speed. I am debating between just changing the last mufflers or whether it’s worth it to go with the whole cat back system. Has anyone just changed the rear mufflers, leaving the resonators, cats, etc? I would probably go with either Magnaflow, Borla or Flowmaster. I know that justt going this route will not net a great deal of power, but from what I’ve read, even the full systems are only good for 10-12 crank hp.

I’ve searched a lot of different posts, but don’t seem to see this one specifically.

Thoughts?