My 05 muffler was defiantly not straight thru.
I have a setup I cam across on a diesel forum, I forget the name of it, but it's basically a 5" turbo back with a resonator that goes under the cab. It's actually quieter in the cab than the factory setup was but a little louder at the tip. Not "look at me loud" though.
The resonator is not a glass pack type design, it is a smaller straight thru center, with a auger type outer design. It's the same size as the rest of the pipe, 5".
No cat, no muffler. No emissions here were I live.
Stock muffler rusted out, otherwise I probably would have just left it on.
