Repacking D&D exhaust

[card16969]

I am repacking my D&D carbon fiber race core exhaust system, Im wondering what type of filling ppl have used and the weight of it. Ive heard of using rock wool and I have bails of it because I am building a powder coating oven and well that would be free. What materials affect sound and performance in which ways? I want to keep the deep growl but clean up the blown out sound it has now. Its been over 10k miles since I put the exhaust on and it was used when I bought it and I miss the original sound and would love to deepen it up more. Also considering shortening the cans

[bikerboy2182]

if its free then why not just give a few hours of labor and try it out? im sure itll sound fine. i pulled about 3/4 of the packing out of my two bros to get the sound i want. its easy just need some rivits and time

[card16969]

So nobody has any experience? I understand how to do it just want to know peoples experience with different packings etc

[sixpack577]

I've used steel wool several times on dirt and street bikes.
It works well.
The fiberglass muffler packing dampens the sound a little more, simply because it is not as porous.
I've shortened quite a few mufflers over the years too. It's easy to do, and doesn't make a dramatic difference in sound(slight change in tone and barely louder, unless you cut it down to 1/2 of it's original size).
I'de cut the cans for looks and use the free packing you have. It'll sound a little different, but not obnoxious.
Worst case is that you don't like the sound, have a little more labor time, and have to use a few more rivots.