That's kinda what I was thinking as well. The SRT manifolds do have a 3" outlet but that get gets choked down anyway. This has been one of my hardest decisions because I'm like "more power!" but it's not like I really need it.
Other thisng is the ceramic worth 200 bucks..ceramic has a warranty. Bare does not
Here's a TTI link for a pic of the shorties mounted up
https://www.ttiexhaust.com/Classics-Hdr/6417825-Shorty/6417825.pic01.jpg