Dave is correct. They are different than most common pitts type incowl mufflers. But these are also tuned exhausts.
Dub redesigned the turbos recently, mainly to address the application fit issues.
They are now what we call the 'pancake' configuration. The 10cc and 15cc versions are about .3" shallower, and just slightly (.25") larger in diameter.
Attached are a few application examples (I have Dave's corsair here too). These are all the original versions.
this one is my Edge 540T, jett 100L