Supertrapp vs Kerker Stouts

[Jason605]

Which of these two are louder, not looking for deeper.
https://www.youtube.com/watch?v=k4wecp9-LKI

I've read that the Kerker's are supposed to be louder but in this video to me the Supertrapp are louder and exactly what i'm looking for. I just want to make sure the video is correct. I've called them and don't get anyone.

[yobtaf103]

Go to their FB page, clip where they say Kerker 8db louder than stock Supertrapp 3db
not sound that way on your clip, think they lost the plot guy says Disc muffler the most popular, but not offered them in black for S models when i asked!