I run an old MAC4/1 header and had a stainless flange/adapter made to mount this Two Brothers CBR 600rr can. Here is a pic, I need to do a new one as I fab'ed a new hanger for it the other night @ 1am...
If I hate it one day, or break it I can just bolt back up the MAC muffler, that is why I didn't weld it up.