I welded what holes I could get to with stainless mig. Then wrapped everything with stainless steel wool and clamped with stainless clamps. Then filled the muffler void with stainless steel wool. Welded shut with stainless tig. No drone and a good increase in a nice sound with a few burbles and pops (MHD stage 1+ burble off). Essentially now an after market straight thru muffler.
