Soren, I got the same ones you have and the place where you suggested.
Yes, mine have the internal baffle near the end of the fishtale.
Yesterday, I put five (5) chorboy stainless steel scrubbing pads in each pipe (from the inlet side), but they are still really loud!
I used stainless so no rust and maybe less chance of the steel wool going on fire. Still too loud for me and my other bike is a 1200C with straight pipes and baffels.