Your V6 is never going to sound deep. Not sure why you posted... you are headed in the direction I'd suggest.
Your links have video files with audio so you can hear exactly how these systems sound. If you want to find out how other systems sound... there are a ton of them on YouTube linked from manufacturer's sites like the 2 you posted. Listen and compare.
Then go someplace where Mustang drivers hang out... Cars and Coffee or Mustang cruise-ins and ask about their cars. Nearly everyone I've ever talked to about mufflers will fire them up and let you listen. They can tell you if the interior drone makes you want to rip off your ears after 50 highway miles.
The Pypes duals with the small mid-mounted mufflers have a good chance of reduced drone if you like their tone. Doesn't matter if they are glass-packs if you like the tone.