Some turbo mufflers are louder than others. The tine ones are usually single tube, and pretty loud. I took some big ones off a guys truck, and they sounded pretty good and not too loud, but he wanted some 40 series. I got to keep them, so I cut them apart. I took the design, and put it into a smaller compartment. So now I make my own! Lol.
Here's some sound clips.