They were street glides, looked like twin cam engines to me. I figured there would be a forum member or two who might know a guy who knows a guy that says they all use bassani model L301 but the trick is using a Mackie 501 cam, or something like that
Not trying to be smartass but that is just ridiculous !! Best thing you can do is go on youtube and start searching exhaust sound clips or start going to your local bike nights and when you hear something you like go up to the owner and start talking. One point of warning, if you hear something you like from a "Big Club" member, they might not like you approaching them.
What sounds great to some is not so pleasing to others, although what you describe sounds good to me .. I like a Deep Toned Rumble that can be the sound of Power being heard without being obnoxious loud .. Hard Combination to put together ..
Asking someone to name a particular exhaust with no other info will get you nothing more than a wild *** guess.
Fair enough, I thought I'd give it a shot anyway. Its tough to tell what has bass and rumble on youtube videos, I'll just ask around at the next rally I go to