I heard one audio clip and then an actual car in person. Very loud (old school) and some popping, IMO anyway. Lots of choices and lots of opinions. And you know opinions, they're like an a-hole, everybody has one.
Good luck.
Felix el Gato.
Not really in the same class as those. The SLP is a resonator not really a muffler from what I have seen and heard.
To answer the question in the post , I think it is incredibly loud on the cobra (heard one two days ago in person). I almost sounded like a 1950's truck with glasspacks or a cherry bomb!