I've been looking at the forum for hours. I've put together this incomplete chart comparing exhausts. I realize the loudness of the exhaust is relative and is somewhat based on the individual. However, this should be a good start for someone to hone in on what they would like to have in an exhaust. For example, I would like the to cruise quietly down the highway (no drone) and yet yield as much power as possible at WOT. I'm keeping the numbers (1-5) relative to the original exhaust; where 1 is quiet (equal to stock) and 5 if very loud compared to stock. I'm willing to update this chart if people would like to give feedback. Hopefully, this will help others as well as me.