The first repack (with typical loose fiberglass mat) I tried adding some DIY "baffles" made of eye bolts with a bolt+washers+acorn nut through the center. It worked reasonably well at quieting it down without loosing the tone. But it quickly blew out the packing near the first baffle.
This time I'm going to try repacking by wrapping the tube with stove gasket rope.. Removing the DIY baffles and add a typical DB reducer on the exit. Anyone else tried stove rope before?