If you're keeping the cats, and it's true duals after them, then the only thing left to do is change the mufflers...
What's on there now (if you can tell)? What don't you like about the sound? If it's too raspy for you, you could try welding in a cross-pipe to simulate an H-pipe. (There are also "dual exhaust adapters" that do the same thing). If it's too loud, you could change to chambered muffler (Flowmaster 40 series or similar).
List anything else that bugs ya, and we might be able to help. :yelpleased:
FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver POWER
: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage) STYLE
: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs RIMS
: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear TIRES
: BFG KDW/2 245/40R18 front, 275/35R18 rear