I'm sorry, I mis-stated my question. I want to know if HD catalog screaming eagle touring mufflers replacements are the same on both sides. I'm not sure if they are called Screaming Eagle, but I mean the ones in the cataloge that guys on other threads were complaining that they were too quiet.
"Too quiet" is what I was alluding to above when I said what I said about "3 dB" difference in "sound volume" (which is what those mufflers are rated at; +3 dB over stock). I'd put money on them being the same conventional construction both sides.