I built these baffles & stuffed them with steel wool. After I stuffed the baffles I put a gold scour pad at the bottom to keep the regular stuff from being blown out. The gold pad took about 15-20 min to put in... it definitely ain't comin' out!!! I welded a strip of metal on the top of the baffles to keep them centered in the pipe & then stuffed more steel wool around the outside. I drilled a 1" hole in the end & then cut 4 divits around the edges & welded them in. Sounds really good & should sound even better once some of the steel wool gets burned out!
BoB
BoB