I also recently upgraded because of heavy rusting on mine from PO...i was recommended by several posters here to get the Thrush welded glass packed, and did- 26 bucks was all it cost for the muffler, and I;m extremely happy with it. It's throaty, but not too loud that it's "try-hard". I personally don;t have any tools ro knowledge on exhaust so i had it installed and new pipe put in from there to the back, 100 bucks for that.
there's other options (catback systems mostly) that are better quality, but they're also $300-$400. It's a Jeep, so i went with something that sounded good, and wasn't too expensive. Would rather rip off a 26 dollar muffler than a $300 one
edit: wizard ^^^