273 stock , what mufflers for duals ?

Here you can see I am rolling the stainless steel back to show the size of the perforations in the tube. I also have an image of the stainless steel sock that is used to wrap the center tube. it acts like filter and prevents the fiberglass from blowing out and it also does some sound energy absorption although not a lot.
this pattern is one that makes a muffler that often has an aggressive and crackly tone.