My 79 bronco wears a pair of 16" glass packs, that I'm certain all the glass is long gone out of.
My 79 bronco had a set of "no packs". The exhaust was long rusted off. It was a loud, obnoxious vehicle. It drove my buddies neighbor nuts. When I sold it and bought a 76 F150 with a 360 or 390 (never could figure it out) which was equally as loud. The neighbor guy came out and said "do you ever drive anything that's quiet?"