Yes the OE mufflers are similar to "Turbo mufflers",
If your wanting something with a a deeper tone , the 2011-12 GT500 muffler is a little different and can be found fairly cheap,, it uses three chambers and a couple perforated cores running between them. They sound pretty good on a GT.
2010 Grabber Blue Mustang GT, Forged 4.6L Roush TVS and other stuff ... The modding shall never end ...
Wife's car ... 2014 Sterling Gray Premium GT 401A, stock for now ..