I know what you mean Doc, my CB750 had some 2 into 1 turnout duals. At 10,000 or more rpm, it just wailed. Think the CB350 was louder and a lot more nasty sounding, some aftermarket mufflers about 3ft long with not much in them.
I used to be the worst, everything was headers and glaspacks, the dreaded Thrush or Tiger mufflers, Basani or Hooker chambers on 2-strokes, etc. Never thought a thing about turning the Peavey up and wailing on it either.
For many years now I've been keeping the pipes quiet. Got a real screamin' case of tinnitis going and it just keeps getting worse. One night at the track it felt like a pencil got jammed in my ear, and it's been on ever since. For quite a while I always had earplugs, even mowing grass, but finally gave up, it was just too late.
I think there's a whole lot more traffic now, and a whole lot more people building for loud pipes, loud stereos, etc. A lot of the stuff has a really good sound, but people don't have any consideration about how or when they use it. I swear I could do a video tomorrow and you'd think I was at a track or an airport runway. Guess it's time to move out to the mountain top.
Saw one of the new Camaros, with a giant muffler like a steamer trunk and four outlets. Well two of those outlets are on pressure sensitive valves that bypass the baffles when you stand on it. Electric cutouts are getting popular too, I guess the old manual cutouts are all done.
When I moved here in '85, I wondered why all the neighbors were deaf. I found out.