Getting a more muscle sound out of a 6

Watch till the end, that is a dyno max 3 chambered muffler with a 2 1/2 out the back.

Omg that makes me miss my slant six!!
When I drove mine I straight piped it for a while no muffler just a straight pipe from the converter back is was loud. Sounded like a 4 banger dirt car when I got on it but it sounded really good just idling and cruising. I ended up putting a thrush turbo muffler on it. Couldn't really hear it much. Sounds alot like the video idling