So my next adventure will be keeping my turbo 370" quiet in my 2500hd when I get the engine done.
Don't worry about the stock mufflers. They are huge.
After doing exhaust on turbo trucks for years I'm going to try this.
S475/96 turbo
4" down pipe,
Single 4" to dual 3",
Dual 3" dynomax mufflers 17235,
Dual 3" to single 4",
4" tail pipe
My last setup on my '91 with turbo 5.3 was 4" all the way out with a 4" diesel muffler and it was quiet but very deep and had a turn down at the Roll pan. It was ok but I want really quiet in my 2500hd so if that setup doesnt work how i want. Ill add Vibrant Resonator before each muffler. I think they are 17960 part number