While that looks like a good mod to try, he doesn't give a true representation in the video. Almost kind of a "false advertising" type of thing going on.
He has "sound normalisation" on in the early part and states that the sound is louder in the video than it actually is. Later in the video (after his mod) he has "sound normalisation" off to make it sound "real".
Again, this probably is a good mod that will quieten down the console. I just wish the guy would do another video without adjusting the sound levels to give a true representation of what to expect.
I would much rather go to my grave not needing my gun, than go there wishing I had it.