Yes, I did see that Sticky link while I searched and decided it doesn't help whatsoever. Most of these are recorded on cell phones and from types of phones and perspectives. Sound quality is poor on many and laptop speakers certainly don't help.
I am looking for a written comparison from people who have tried more than one exhaust. Something like, "I have 3" catless Perrin which is MUCH louder than stock, but xxxx exhaust was somewhere in between"