if it's got an x-pipe, it's not divorced duals.
Divorced duals wold be NO midpipe at all.
A midpipe is not needed on these engine those.
If you want one though, an H-pipe or Pro-chamber is suppose to give it a deeper sound. X-pipe is more raspy.
If your keeping the cats, you could try it no mufflers at all. The cats muffle the sound a bit.
I'm running a single exhaust, no muffler, with a singleport 4.2. I've never been pulled over yet, and it sounds okay.
Would probably sound louder with dual exhaust, but i'm happy with it.